diff --git a/session_1/slides_a.Rmd b/session_1/slides_a.Rmd
index 97c3b9b0e7637a58e3f2da7d735cf74bb85061d1..6d8f10a357754c3247d6c051a4338ca5703eaa6c 100644
--- a/session_1/slides_a.Rmd
+++ b/session_1/slides_a.Rmd
@@ -3,6 +3,8 @@ title: 'R#1: Introduction to R and RStudio'
 author: "Laurent Modolo [laurent.modolo@ens-lyon.fr](mailto:laurent.modolo@ens-lyon.fr)"
 date: "10 Oct 2019"
 output:
+  slidy_presentation:
+    highlight: tango
   beamer_presentation:
     theme: metropolis
     slide_level: 3
@@ -10,8 +12,6 @@ output:
     df_print: tibble
     highlight: tango
     latex_engine: xelatex
-  slidy_presentation:
-    highlight: tango
 ---
 ## R#1: Introduction to R and RStudio
 The goal of this practical is to familiarize yourself with R and the RStudio
@@ -39,13 +39,13 @@ The objectives of this session will be to:
   \end{column}
 \end{columns}
 
-# Some R background
+## Some R background
 
 \includegraphics[width=40pt]{img/Rlogo.png}
 is a programming language and free software environment for statistical
 computing and graphics supported by the *R Foundation for Statistical Computing*.
 
-# Some R background
+## Some R background
 
 \includegraphics[width=40pt]{img/Rlogo.png}
 
@@ -54,7 +54,7 @@ computing and graphics supported by the *R Foundation for Statistical Computing*
 - free and open-source implementation the S programming language
 - currently developed by the **R Development Core Team**.
 
-# Some R background
+## Some R background
 
 Reasons to use \includegraphics[width=40pt]{img/Rlogo.png}
 
@@ -66,11 +66,11 @@ Reasons to use \includegraphics[width=40pt]{img/Rlogo.png}
 - **3,087** available packages on http://www.bioconductor.org
 - **122,720** available repository on https://github.com/
 
-# Some R background
+## Some R background
 
 \includegraphics[width=\textwidth]{img/R_terminal.png}
 
-# RStudio, the R IDE
+## RStudio, the R IDE
 
 \begin{block}{IDR: Integrated development environment}
 application that provides {\bf comprehensive facilities} to computer programmers for
@@ -88,7 +88,7 @@ software development
 
 \includegraphics[width=\textwidth]{img/RStudio_console.png}
 
-# R as a calculator
+## R as a calculator
 
 - Add: `+`
 - Divide: `/`
@@ -97,7 +97,7 @@ software development
 - Exponents: `^` or `**`
 - Parentheses: `(`, `)`
 
-# R as a calculator
+## R as a calculator
 
 ```R
 1 + 100
diff --git a/session_1/slides_b.Rmd b/session_1/slides_b.Rmd
index 1831f7543252f7d4596f0d11d5892a3345b3900f..cb12a4b6d59a37a1bd9f48d62a33aaddfef52f0d 100644
--- a/session_1/slides_b.Rmd
+++ b/session_1/slides_b.Rmd
@@ -3,6 +3,10 @@ title: 'R#1: Introduction to R and RStudio'
 author: "Laurent Modolo [laurent.modolo@ens-lyon.fr](mailto:laurent.modolo@ens-lyon.fr)"
 date: "10 Oct 2019"
 output:
+  slidy_presentation:
+    highlight: tango
+  ioslides_presentation:
+    highlight: tango
   beamer_presentation:
     theme: metropolis
     slide_level: 3
@@ -10,10 +14,10 @@ output:
     df_print: tibble
     highlight: tango
     latex_engine: xelatex
-  slidy_presentation:
-    highlight: tango
 ---
+
 ## R#1: Introduction to R and RStudio
+
 The goal of this practical is to familiarize yourself with R and the RStudio
 environment.
 
@@ -194,7 +198,7 @@ unloadNamespace("tidyverse")
 sessionInfo()
 ```
 
-# Complex variable type
+## Complex variable type
 
 ## Vector (aka list)
 
@@ -285,7 +289,7 @@ all.equal(x, y)
 - Check the default vectors `letters` and `LETTERS`, rewrite your previous command using them.
 - Create a vector giving you the correspondence between small case letters and upper case letters.
 
-### Vector challenge
+## Vector challenge
 
 - use the `seq()` function to create a vector of even numbers
 ```R
@@ -295,7 +299,7 @@ seq(from=2, to=10, by=2)
 - Check the default vectors `letters` and `LETTERS`, rewrite your previous command using them.
 - Create a vector giving you the correspondence between small case letters and upper case letters.
 
-### Vector challenge
+## Vector challenge
 
 - use the `seq()` function to create a vector of even numbers
 ```R
@@ -305,7 +309,7 @@ seq(from=2, to=10, by=2)
 - Check the default vectors `letters` and `LETTERS`, rewrite your previous command using them.
 - Create a vector giving you the correspondence between small case letters and upper case letters.
 
-### Vector challenge
+## Vector challenge
 
 - use the `seq()` function to create a vector of even numbers
 - You can concatenate vector with `c(<VECTOR_1>, <VECTOR_2>)`, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.
@@ -316,7 +320,7 @@ typeof(c(1:5, "a", "b", "c"))
 - Check the default vectors `letters` and `LETTERS`, rewrite your previous command using them.
 - Create a vector giving you the correspondence between small case letters and upper case letters.
 
-### Vector challenge
+## Vector challenge
 
 - use the `seq()` function to create a vector of even numbers
 - You can concatenate vector with `c(<VECTOR_1>, <VECTOR_2>)`, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.
@@ -326,7 +330,7 @@ c(1:5, letters[1:3])
 ```
 - Create a vector giving you the correspondence between small case letters and upper case letters.
 
-### Vector challenge
+## Vector challenge
 
 - use the `seq()` function to create a vector of even numbers
 - You can concatenate vector with `c(<VECTOR_1>, <VECTOR_2>)`, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.
@@ -385,4 +389,38 @@ names(data_frame_example)
 ```R
 data_frame_example[2, 3]
 data_frame_example["numbers"]
+```
+
+## List
+
+In R `list` are multitypes object
+
+```R
+list(a = "test", b = 1)
+```
+
+\pause
+
+```R
+list(a = "test", b = 1:5)
+```
+
+\pause
+
+```R
+z <- list(
+  a = "test",
+  b = 1:5,
+  c = data.frame(numbers=1:26, letters=letters, LETTERS=LETTERS)
+)
+```
+
+\pause
+
+```R
+list(
+  a = "test",
+  b = 1:5,
+  c = z
+)
 ```
\ No newline at end of file
diff --git a/session_2/slides.Rmd b/session_2/slides.Rmd
index a39dbadfaf44240af321a9a2a58df550df10836c..3695714fcc65eb72a6d3d63f58284b34b8983fc0 100644
--- a/session_2/slides.Rmd
+++ b/session_2/slides.Rmd
@@ -3,6 +3,8 @@ title: "R#2: introduction to Tidyverse"
 author: "Laurent Modolo [laurent.modolo@ens-lyon.fr](mailto:laurent.modolo@ens-lyon.fr)"
 date: "24 Oct 2019"
 output:
+  slidy_presentation:
+    highlight: tango
   beamer_presentation:
     theme: metropolis
     slide_level: 3
@@ -10,8 +12,6 @@ output:
     df_print: tibble
     highlight: tango
     latex_engine: xelatex
-  slidy_presentation:
-    highlight: tango
 ---
 
 ```{r setup, include=FALSE, cache=TRUE}
@@ -188,26 +188,26 @@ ggplot(data = <DATA>) +
 - Make a scatterplot of `hwy` vs. `cyl`.
 - What happens if you make a scatterplot of `class` vs. `drive`? Why is the plot not useful?
 
-### Run `ggplot(data = mpg)`. What do you see?
+## Run `ggplot(data = mpg)`. What do you see?
 
 ```{r empty_plot, cache = TRUE, fig.width=8, fig.height=4.5}
 ggplot(data = new_mpg)
 ```
 
-### How many rows are in `new_mpg`? How many columns?
+## How many rows are in `new_mpg`? How many columns?
 
 ```{r size_of_mpg, cache = TRUE, fig.width=8, fig.height=4.5}
 new_mpg
 ```
 
-### Make a scatterplot of `hwy` vs. `cyl`.
+## Make a scatterplot of `hwy` vs. `cyl`.
 
 ```{r new_mpg_plot_b, cache = TRUE, fig.width=8, fig.height=4.5}
 ggplot(data = new_mpg) + 
   geom_point(mapping = aes(x = hwy, y = cyl))
 ```
 
-### What happens if you make a scatterplot of `class` vs. `drive`?
+## What happens if you make a scatterplot of `class` vs. `drive`?
 Why is the plot not useful?
 
 ```{r new_mpg_plot_c, cache = TRUE, fig.width=8, fig.height=4.5}
@@ -226,15 +226,14 @@ ggplot(data = mpg) +
              mapping = aes(x = displ, y = hwy), color = "red")
 ```
 
-###  Aesthetic mapping `color`
+##  Aesthetic mapping `color`
 
 ```{r new_mpg_plot_e, cache = TRUE, fig.width=8, fig.height=4.5}
 ggplot(data = mpg) + 
   geom_point(mapping = aes(x = displ, y = hwy, color = class))
 ```
 
-
-###  Aesthetic mappings
+##  Aesthetic mappings
 
 `ggplot2` will automatically assign a unique level of the aesthetic (here a unique color) to each unique value of the variable, a process known as scaling. `ggplot2` will also add a legend that explains which levels correspond to which values.
 
@@ -244,28 +243,28 @@ Try the following aesthetic:
 - `alpha`
 - `shape`
 
-###  Aesthetic mapping `size`
+##  Aesthetic mapping `size`
 
 ```{r new_mpg_plot_f, cache = TRUE, fig.width=8, fig.height=4.5, warning=FALSE}
 ggplot(data = mpg) + 
   geom_point(mapping = aes(x = displ, y = hwy, size = class))
 ```
 
-###  Aesthetic mapping `alpha`
+##  Aesthetic mapping `alpha`
 
 ```{r new_mpg_plot_g, cache = TRUE, fig.width=8, fig.height=4.5, warning=FALSE}
 ggplot(data = mpg) + 
   geom_point(mapping = aes(x = displ, y = hwy, alpha = class))
 ```
 
-###  Aesthetic mapping `shape`
+##  Aesthetic mapping `shape`
 
 ```{r new_mpg_plot_h, cache = TRUE, fig.width=8, fig.height=4.5, warning=FALSE}
 ggplot(data = mpg) + 
   geom_point(mapping = aes(x = displ, y = hwy, shape = class))
 ```
 
-###  Aesthetic
+##  Aesthetic
 
 You can also set the aesthetic properties of your geom manually. For example, we can make all of the points in our plot blue:
 
@@ -295,6 +294,7 @@ ggplot(data = mpg) +
   geom_point(mapping = aes(x = displ, y = hwy)) + 
   facet_wrap(~class)
 ```
+
 ## Facets
 
 ```{r new_mpg_plot_k, cache = TRUE, fig.width=8, fig.height=4.5}
diff --git a/web/slides_a.html b/web/slides_a.html
index f2ddbaea319b5c2c098242c9b55a8c07f158c5e4..f3df2bf54c619ee40eb694155905b78ed27ee89f 100644
--- a/web/slides_a.html
+++ b/web/slides_a.html
@@ -432,9 +432,8 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
   </p>
   <p class="date">10 Oct 2019</p>
 </div>
-<div class="slide section level1">
-
-<h2 id="r1-introduction-to-r-and-rstudio">R#1: Introduction to R and RStudio</h2>
+<div id="r1-introduction-to-r-and-rstudio" class="slide section level2">
+<h1>R#1: Introduction to R and RStudio</h1>
 <p>The goal of this practical is to familiarize yourself with R and the RStudio environment.</p>
 <p>The objectives of this session will be to:</p>
 <ul>
@@ -445,14 +444,16 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 <li>Call functions</li>
 <li>Manage packages</li>
 </ul>
-<h2 id="acknowledgments">Acknowledgments</h2>
+</div>
+<div id="acknowledgments" class="slide section level2">
+<h1>Acknowledgments</h1>
 
 </div>
-<div id="some-r-background" class="slide section level1">
+<div id="some-r-background" class="slide section level2">
 <h1>Some R background</h1>
 <p> is a programming language and free software environment for statistical computing and graphics supported by the <em>R Foundation for Statistical Computing</em>.</p>
 </div>
-<div id="some-r-background-1" class="slide section level1">
+<div id="some-r-background-1" class="slide section level2">
 <h1>Some R background</h1>
 <p></p>
 <ul>
@@ -462,7 +463,7 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 <li>currently developed by the <strong>R Development Core Team</strong>.</li>
 </ul>
 </div>
-<div id="some-r-background-2" class="slide section level1">
+<div id="some-r-background-2" class="slide section level2">
 <h1>Some R background</h1>
 <p>Reasons to use </p>
 <ul>
@@ -474,23 +475,27 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 <li><p><strong>122,720</strong> available repository on <a href="https://github.com/" class="uri">https://github.com/</a></p></li>
 </ul>
 </div>
-<div id="some-r-background-3" class="slide section level1">
+<div id="some-r-background-3" class="slide section level2">
 <h1>Some R background</h1>
 <p></p>
 </div>
-<div id="rstudio-the-r-ide" class="slide section level1">
+<div id="rstudio-the-r-ide" class="slide section level2">
 <h1>RStudio, the R IDE</h1>
 
 <ul>
 <li>free</li>
 <li>open source</li>
 </ul>
-<h2 id="an-interface">An interface</h2>
+</div>
+<div id="an-interface" class="slide section level2">
+<h1>An interface</h1>
 <p></p>
-<h2 id="the-same-console-as-before">The same console as before</h2>
+</div>
+<div id="the-same-console-as-before" class="slide section level2">
+<h1>The same console as before</h1>
 <p></p>
 </div>
-<div id="r-as-a-calculator" class="slide section level1">
+<div id="r-as-a-calculator" class="slide section level2">
 <h1>R as a calculator</h1>
 <ul>
 <li>Add: <code>+</code></li>
@@ -501,7 +506,7 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 <li>Parentheses: <code>(</code>, <code>)</code></li>
 </ul>
 </div>
-<div id="r-as-a-calculator-1" class="slide section level1">
+<div id="r-as-a-calculator-1" class="slide section level2">
 <h1>R as a calculator</h1>
 <div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1"></a><span class="dv">1</span> <span class="op">+</span><span class="st"> </span><span class="dv">100</span></span>
 <span id="cb1-2"><a href="#cb1-2"></a><span class="dv">1</span> <span class="op">+</span></span></code></pre></div>
@@ -517,7 +522,9 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 
 <p><code>2e-4</code> is shorthand for <code>2 * 10^(-4)</code></p>
 <div class="sourceCode" id="cb6"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1"></a><span class="fl">5e3</span></span></code></pre></div>
-<h2 id="mathematical-functions">Mathematical functions</h2>
+</div>
+<div id="mathematical-functions" class="slide section level2">
+<h1>Mathematical functions</h1>
 <div class="sourceCode" id="cb7"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1"></a><span class="kw">log</span>(<span class="dv">1</span>)  <span class="co"># natural logarithm</span></span></code></pre></div>
 
 <div class="sourceCode" id="cb8"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1"></a><span class="kw">log10</span>(<span class="dv">10</span>) <span class="co"># base-10 logarithm</span></span></code></pre></div>
@@ -527,7 +534,9 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 <p>Compute the factorial of <code>9</code></p>
 
 <div class="sourceCode" id="cb10"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1"></a><span class="kw">factorial</span>(<span class="dv">9</span>)</span></code></pre></div>
-<h2 id="comparing-things">Comparing things</h2>
+</div>
+<div id="comparing-things" class="slide section level2">
+<h1>Comparing things</h1>
 <p>equality (note two equal signs read as “is equal to”)</p>
 <div class="sourceCode" id="cb11"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb11-1"><a href="#cb11-1"></a><span class="dv">1</span> <span class="op">==</span><span class="st"> </span><span class="dv">1</span></span></code></pre></div>
 
@@ -542,13 +551,19 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 
 <p>greater than</p>
 <div class="sourceCode" id="cb15"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb15-1"><a href="#cb15-1"></a><span class="dv">1</span> <span class="op">&gt;</span><span class="st"> </span><span class="dv">0</span></span></code></pre></div>
-<h2 id="variables-and-assignment">Variables and assignment</h2>
+</div>
+<div id="variables-and-assignment" class="slide section level2">
+<h1>Variables and assignment</h1>
 <p><code>&lt;-</code> is the assignment operator in R. (read as left member take right member value)</p>
 <div class="sourceCode" id="cb16"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb16-1"><a href="#cb16-1"></a>x &lt;-<span class="st"> </span><span class="dv">1</span><span class="op">/</span><span class="dv">40</span></span></code></pre></div>
 <div class="sourceCode" id="cb17"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb17-1"><a href="#cb17-1"></a>x</span></code></pre></div>
-<h2 id="the-environment">The environment</h2>
+</div>
+<div id="the-environment" class="slide section level2">
+<h1>The environment</h1>
 <p></p>
-<h2 id="variables-and-assignment-1">Variables and assignment</h2>
+</div>
+<div id="variables-and-assignment-1" class="slide section level2">
+<h1>Variables and assignment</h1>
 <div class="sourceCode" id="cb18"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb18-1"><a href="#cb18-1"></a><span class="kw">log</span>(x)</span>
 <span id="cb18-2"><a href="#cb18-2"></a>x &lt;-<span class="st"> </span><span class="dv">100</span></span>
 <span id="cb18-3"><a href="#cb18-3"></a><span class="kw">log</span>(x)</span></code></pre></div>
@@ -558,7 +573,9 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 
 <div class="sourceCode" id="cb20"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb20-1"><a href="#cb20-1"></a>z &lt;-<span class="st"> &quot;x&quot;</span></span>
 <span id="cb20-2"><a href="#cb20-2"></a>x <span class="op">+</span><span class="st"> </span>z</span></code></pre></div>
-<h2 id="variables-and-assignment-2">Variables and assignment</h2>
+</div>
+<div id="variables-and-assignment-2" class="slide section level2">
+<h1>Variables and assignment</h1>
 <p>Variable names can contain letters, numbers, underscores and periods.</p>
 <p>They cannot start with a number nor contain spaces at all.</p>
 <p>Different people use different conventions for long variable names, these include</p>
@@ -568,7 +585,9 @@ Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-ly
 <p>What you use is up to you, but be consistent.</p>
 
 <p>It is also possible to use the <code>=</code> operator for assignment but <strong>don’t do it !</strong></p>
-<h2 id="variables-and-assignment-3">Variables and assignment</h2>
+</div>
+<div id="variables-and-assignment-3" class="slide section level2">
+<h1>Variables and assignment</h1>
 <p>Which of the following are valid R variable names?</p>
 <pre><code>min_height
 max.height
@@ -579,7 +598,9 @@ min-length
 2widths
 celsius2kelvin</code></pre>
 <p><strong><a href="http://perso.ens-lyon.fr/laurent.modolo/R/1_a" class="uri">http://perso.ens-lyon.fr/laurent.modolo/R/1_a</a></strong></p>
-<h2 id="functions-are-also-variables">Functions are also variables</h2>
+</div>
+<div id="functions-are-also-variables" class="slide section level2">
+<h1>Functions are also variables</h1>
 <div class="sourceCode" id="cb23"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb23-1"><a href="#cb23-1"></a>logarithm &lt;-<span class="st"> </span>log</span></code></pre></div>
 
 <p>A R function can have different arguments</p>
@@ -594,18 +615,24 @@ celsius2kelvin</code></pre>
 <div class="sourceCode" id="cb25"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb25-1"><a href="#cb25-1"></a><span class="kw">help</span>(log)</span></code></pre></div>
 
 <div class="sourceCode" id="cb26"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb26-1"><a href="#cb26-1"></a>?log</span></code></pre></div>
-<h2 id="various-output">Various output</h2>
+</div>
+<div id="various-output" class="slide section level2">
+<h1>Various output</h1>
 <p></p>
-<h2 id="functions-are-also-variables-1">Functions are also variables</h2>
+</div>
+<div id="functions-are-also-variables-1" class="slide section level2">
+<h1>Functions are also variables</h1>
 <p>Test that your <code>logarithm</code> function can work in base 10</p>
 
 <div class="sourceCode" id="cb27"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb27-1"><a href="#cb27-1"></a><span class="dv">10</span><span class="op">^</span><span class="kw">logarithm</span>(<span class="dv">12</span>, <span class="dt">base =</span> <span class="dv">10</span>)</span></code></pre></div>
-<h2 id="functions-are-also-variables-2">Functions are also variables</h2>
+</div>
+<div id="functions-are-also-variables-2" class="slide section level2">
+<h1>Functions are also variables</h1>
 <p>We can also define our own function with</p>
-<div class="sourceCode" id="cb28"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb28-1"><a href="#cb28-1"></a>function_name &lt;-<span class="st"> </span><span class="cf">function</span>(a, b){</span>
-<span id="cb28-2"><a href="#cb28-2"></a>  result_<span class="dv">1</span> &lt;-<span class="st"> </span><span class="kw">operation1</span>(a, b)</span>
-<span id="cb28-3"><a href="#cb28-3"></a>  result_<span class="dv">2</span> &lt;-<span class="st"> </span><span class="kw">operation2</span>(result_<span class="dv">1</span>, b)</span>
-<span id="cb28-4"><a href="#cb28-4"></a>  <span class="kw">return</span>(result_<span class="dv">2</span>)</span>
+<div class="sourceCode" id="cb28"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb28-1"><a href="#cb28-1"></a><span class="op">&lt;</span>FUNCTION_NAME<span class="op">&gt;</span><span class="st"> </span><span class="er">&lt;</span><span class="op">-</span><span class="st"> </span><span class="cf">function</span>(a, b){</span>
+<span id="cb28-2"><a href="#cb28-2"></a>  <span class="op">&lt;</span>RESULT_<span class="dv">1</span><span class="op">&gt;</span><span class="st"> </span><span class="er">&lt;</span><span class="op">-</span><span class="st"> </span><span class="er">&lt;</span>OPERATION_<span class="dv">1</span><span class="op">&gt;</span>(a, b)</span>
+<span id="cb28-3"><a href="#cb28-3"></a>  <span class="op">&lt;</span>RESULT_<span class="dv">2</span><span class="op">&gt;</span><span class="st"> </span><span class="er">&lt;</span><span class="op">-</span><span class="st"> </span><span class="er">&lt;</span>OPERATION_<span class="dv">2</span><span class="op">&gt;</span>(<span class="op">&lt;</span>RESULT_<span class="dv">1</span><span class="op">&gt;</span>, b)</span>
+<span id="cb28-4"><a href="#cb28-4"></a>  <span class="kw">return</span>(<span class="op">&lt;</span>RESULT_<span class="dv">2</span><span class="op">&gt;</span>)</span>
 <span id="cb28-5"><a href="#cb28-5"></a>}</span></code></pre></div>
 
 <p>write a function to test the base of the logarithm function</p>
diff --git a/web/slides_b.html b/web/slides_b.html
new file mode 100644
index 0000000000000000000000000000000000000000..9b17bf1d6c952adfcfa8caec7331c7498a2272ef
--- /dev/null
+++ b/web/slides_b.html
@@ -0,0 +1,725 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+  <meta http-equiv="Content-Style-Type" content="text/css" />
+  <meta name="generator" content="pandoc" />
+  <meta name="author" content="Laurent Modolo laurent.modolo@ens-lyon.fr" />
+  <meta name="date" content="2019-10-10" />
+  <title>R#1: Introduction to R and RStudio</title>
+  <style type="text/css">code{white-space: pre;}</style>
+  <style type="text/css">
+pre > code.sourceCode { white-space: pre; position: relative; }
+pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
+pre > code.sourceCode > span:empty { height: 1.2em; }
+code.sourceCode > span { color: inherit; text-decoration: inherit; }
+div.sourceCode { margin: 1em 0; }
+pre.sourceCode { margin: 0; }
+@media screen {
+div.sourceCode { overflow: auto; }
+}
+@media print {
+pre > code.sourceCode { white-space: pre-wrap; }
+pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
+}
+pre.numberSource code
+  { counter-reset: source-line 0; }
+pre.numberSource code > span
+  { position: relative; left: -4em; counter-increment: source-line; }
+pre.numberSource code > span > a:first-child::before
+  { content: counter(source-line);
+    position: relative; left: -1em; text-align: right; vertical-align: baseline;
+    border: none; display: inline-block;
+    -webkit-touch-callout: none; -webkit-user-select: none;
+    -khtml-user-select: none; -moz-user-select: none;
+    -ms-user-select: none; user-select: none;
+    padding: 0 4px; width: 4em;
+    color: #aaaaaa;
+  }
+pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa;  padding-left: 4px; }
+div.sourceCode
+  {  background-color: #f8f8f8; }
+@media screen {
+pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
+}
+code span.al { color: #ef2929; } /* Alert */
+code span.an { color: #8f5902; font-weight: bold; font-style: italic; } /* Annotation */
+code span.at { color: #c4a000; } /* Attribute */
+code span.bn { color: #0000cf; } /* BaseN */
+code span.cf { color: #204a87; font-weight: bold; } /* ControlFlow */
+code span.ch { color: #4e9a06; } /* Char */
+code span.cn { color: #000000; } /* Constant */
+code span.co { color: #8f5902; font-style: italic; } /* Comment */
+code span.cv { color: #8f5902; font-weight: bold; font-style: italic; } /* CommentVar */
+code span.do { color: #8f5902; font-weight: bold; font-style: italic; } /* Documentation */
+code span.dt { color: #204a87; } /* DataType */
+code span.dv { color: #0000cf; } /* DecVal */
+code span.er { color: #a40000; font-weight: bold; } /* Error */
+code span.ex { } /* Extension */
+code span.fl { color: #0000cf; } /* Float */
+code span.fu { color: #000000; } /* Function */
+code span.im { } /* Import */
+code span.in { color: #8f5902; font-weight: bold; font-style: italic; } /* Information */
+code span.kw { color: #204a87; font-weight: bold; } /* Keyword */
+code span.op { color: #ce5c00; font-weight: bold; } /* Operator */
+code span.ot { color: #8f5902; } /* Other */
+code span.pp { color: #8f5902; font-style: italic; } /* Preprocessor */
+code span.sc { color: #000000; } /* SpecialChar */
+code span.ss { color: #4e9a06; } /* SpecialString */
+code span.st { color: #4e9a06; } /* String */
+code span.va { color: #000000; } /* Variable */
+code span.vs { color: #4e9a06; } /* VerbatimString */
+code span.wa { color: #8f5902; font-weight: bold; font-style: italic; } /* Warning */
+  </style>
+  <style type="text/css">
+body
+{
+margin: 0 0 0 0;
+padding: 0 0 0 0;
+width: 100%;
+height: 100%;
+color: black;
+background-color: white;
+font-family: "Gill Sans MT", "Gill Sans", GillSans, sans-serif;
+font-size: 14pt;
+}
+div.toolbar {
+position: fixed; z-index: 200;
+top: auto; bottom: 0; left: 0; right: 0;
+height: 1.2em; text-align: right;
+padding-left: 1em;
+padding-right: 1em; font-size: 60%;
+color: DimGray;
+background-color: rgb(240,240,240);
+border-top: solid 1px rgb(180,180,180);
+}
+div.toolbar span.copyright {
+color: DimGray;
+margin-left: 0.5em;
+}
+div.initial_prompt {
+position: absolute;
+z-index: 1000;
+bottom: 1.2em;
+width: 100%;
+background-color: rgb(200,200,200);
+opacity: 0.35;
+background-color: rgb(200,200,200, 0.35);
+cursor: pointer;
+}
+div.initial_prompt p.help {
+text-align: center;
+}
+div.initial_prompt p.close {
+text-align: right;
+font-style: italic;
+}
+div.slidy_toc {
+position: absolute;
+z-index: 300;
+width: 60%;
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+height: 30em;
+overflow: auto;
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+bottom: 4em;
+padding: 1em;
+background: rgb(240,240,240);
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+border-width: 2px;
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+}
+div.slidy_toc .toc_heading {
+text-align: center;
+width: 100%;
+margin: 0;
+margin-bottom: 1em;
+border-bottom-style: solid;
+border-bottom-color: rgb(180,180,180);
+border-bottom-width: 1px;
+}
+div.slide {
+z-index: 20;
+margin: 0 0 0 0;
+padding-top: 0;
+padding-bottom: 0;
+padding-left: 20px;
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+clear: both;
+top: 0;
+bottom: 0;
+left: 0;
+right: 0;
+line-height: 120%;
+background-color: transparent;
+}
+div.background {
+display: none;
+}
+div.handout {
+margin-left: 20px;
+margin-right: 20px;
+}
+div.slide.titlepage {
+text-align: center;
+}
+div.slide.titlepage h1 {
+padding-top: 10%;
+margin-right: 0;
+}
+div.slide h1 {
+padding-left: 0;
+padding-right: 20pt;
+padding-top: 4pt;
+padding-bottom: 4pt;
+margin-top: 0;
+margin-left: 0;
+margin-right: 60pt;
+margin-bottom: 0.5em;
+display: block; font-size: 160%;
+line-height: 1.2em;
+background: transparent;
+}
+@media screen and (max-device-width: 1024px)
+{
+div.slide { font-size: 100%; }
+}
+@media screen and (max-device-width: 800px)
+{
+div.slide { font-size: 200%; }
+div.slidy_toc {
+top: 1em;
+left: 1em;
+right: auto;
+width: 80%;
+font-size: 180%;
+}
+}
+div.toc-heading {
+width: 100%;
+border-bottom: solid 1px rgb(180,180,180);
+margin-bottom: 1em;
+text-align: center;
+}
+img {
+image-rendering: optimize-quality;
+}
+pre {
+font-size: 80%;
+font-weight: bold;
+line-height: 120%;
+padding-top: 0.2em;
+padding-bottom: 0.2em;
+padding-left: 1em;
+padding-right: 1em;
+border-style: solid;
+border-left-width: 1em;
+border-top-width: thin;
+border-right-width: thin;
+border-bottom-width: thin;
+border-color: #95ABD0;
+color: #00428C;
+background-color: #E4E5E7;
+}
+li pre { margin-left: 0; }
+blockquote { font-style: italic }
+img { background-color: transparent }
+p.copyright { font-size: smaller }
+.center { text-align: center }
+.footnote { font-size: smaller; margin-left: 2em; }
+a img { border-width: 0; border-style: none }
+a:visited { color: navy }
+a:link { color: navy }
+a:hover { color: red; text-decoration: underline }
+a:active { color: red; text-decoration: underline }
+a {text-decoration: none}
+.toolbar a:link {color: blue}
+.toolbar a:visited {color: blue}
+.toolbar a:active {color: red}
+.toolbar a:hover {color: red}
+ul { list-style-type: square; }
+ul ul { list-style-type: disc; }
+ul ul ul { list-style-type: circle; }
+ul ul ul ul { list-style-type: disc; }
+li { margin-left: 0.5em; margin-top: 0.5em; }
+li li { font-size: 85%; font-style: italic }
+li li li { font-size: 85%; font-style: normal }
+div dt
+{
+margin-left: 0;
+margin-top: 1em;
+margin-bottom: 0.5em;
+font-weight: bold;
+}
+div dd
+{
+margin-left: 2em;
+margin-bottom: 0.5em;
+}
+p,pre,ul,ol,blockquote,h2,h3,h4,h5,h6,dl,table {
+margin-left: 1em;
+margin-right: 1em;
+}
+p.subhead { font-weight: bold; margin-top: 2em; }
+.smaller { font-size: smaller }
+.bigger { font-size: 130% }
+td,th { padding: 0.2em }
+ul {
+margin: 0.5em 1.5em 0.5em 1.5em;
+padding: 0;
+}
+ol {
+margin: 0.5em 1.5em 0.5em 1.5em;
+padding: 0;
+}
+ul { list-style-type: square; }
+ul ul { list-style-type: disc; }
+ul ul ul { list-style-type: circle; }
+ul ul ul ul { list-style-type: disc; }
+ul li { list-style: square;
+margin: 0.1em 0em 0.6em 0;
+padding: 0 0 0 0;
+line-height: 140%;
+}
+ol li { margin: 0.1em 0em 0.6em 1.5em;
+padding: 0 0 0 0px;
+line-height: 140%;
+list-style-type: decimal;
+}
+li ul li { font-size: 85%; font-style: italic;
+list-style-type: disc;
+background: transparent;
+padding: 0 0 0 0;
+}
+li li ul li { font-size: 85%; font-style: normal;
+list-style-type: circle;
+background: transparent;
+padding: 0 0 0 0;
+}
+li li li ul li {
+list-style-type: disc;
+background: transparent;
+padding: 0 0 0 0;
+}
+li ol li {
+list-style-type: decimal;
+}
+li li ol li {
+list-style-type: decimal;
+}
+
+ol.outline li:hover { cursor: pointer }
+ol.outline li.nofold:hover { cursor: default }
+ul.outline li:hover { cursor: pointer }
+ul.outline li.nofold:hover { cursor: default }
+ol.outline { list-style:decimal; }
+ol.outline ol { list-style-type:lower-alpha }
+ol.outline li.nofold {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAIACAMzMzOvr/ywAAAAACQAJAAACD4SPoRvG614Dctb4MEMcFAA7) no-repeat 0px 0.5em;
+}
+ol.outline li.unfolded {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAMPD/8zMzOvr/////ywAAAAACQAJAAACEYyPoivG614LAlg7ZZbxoR8UADs=) no-repeat 0px 0.5em;
+}
+ol.outline li.folded {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAMPD/8zMzOvr/////ywAAAAACQAJAAACFIyPoiu2sJyCyoF7W3hxz850CFIAADs=) no-repeat 0px 0.5em;
+}
+ol.outline li.unfolded:hover {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAAAAAAAA/8PD/////ywAAAAACQAJAAACEYSPoivG614DIlg7ZZbxoQ8UADs=) no-repeat 0px 0.5em;
+}
+ol.outline li.folded:hover {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAAAAAAAA/8PD/////ywAAAAACQAJAAACFISPoiu2sZyCyoV7G3hxz850CFIAADs=) no-repeat 0px 0.5em;
+}
+ul.outline li.nofold {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAIACAMzMzOvr/ywAAAAACQAJAAACD4SPoRvG614Dctb4MEMcFAA7) no-repeat 0px 0.5em;
+}
+ul.outline li.unfolded {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAMPD/8zMzOvr/////ywAAAAACQAJAAACEYyPoivG614LAlg7ZZbxoR8UADs=) no-repeat 0px 0.5em;
+}
+ul.outline li.folded {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAMPD/8zMzOvr/////ywAAAAACQAJAAACFIyPoiu2sJyCyoF7W3hxz850CFIAADs=) no-repeat 0px 0.5em;
+}
+ul.outline li.unfolded:hover {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAAAAAAAA/8PD/////ywAAAAACQAJAAACEYSPoivG614DIlg7ZZbxoQ8UADs=) no-repeat 0px 0.5em;
+}
+ul.outline li.folded:hover {
+padding: 0 0 0 20px;
+background: transparent url(data:image/gif;base64,R0lGODdhCQAJAKEDAAAAAAAA/8PD/////ywAAAAACQAJAAACFISPoiu2sZyCyoV7G3hxz850CFIAADs=) no-repeat 0px 0.5em;
+}
+
+a.titleslide { font-weight: bold; font-style: italic }
+
+img.hidden { display: none; visibility: hidden }
+div.initial_prompt { display: none; visibility: hidden }
+div.slide {
+visibility: visible;
+position: inherit;
+}
+div.handout {
+border-top-style: solid;
+border-top-width: thin;
+border-top-color: black;
+}
+@media screen {
+.hidden { display: none; visibility: visible }
+div.slide.hidden { display: block; visibility: visible }
+div.handout.hidden { display: block; visibility: visible }
+div.background { display: none; visibility: hidden }
+body.single_slide div.initial_prompt { display: block; visibility: visible }
+body.single_slide div.background { display: block; visibility: visible }
+body.single_slide div.background.hidden { display: none; visibility: hidden }
+body.single_slide .invisible { visibility: hidden }
+body.single_slide .hidden { display: none; visibility: hidden }
+body.single_slide div.slide { position: absolute }
+body.single_slide div.handout { display: none; visibility: hidden }
+}
+@media print {
+.hidden { display: block; visibility: visible }
+div.slide pre { font-size: 60%; padding-left: 0.5em; }
+div.toolbar { display: none; visibility: hidden; }
+div.slidy_toc { display: none; visibility: hidden; }
+div.background { display: none; visibility: hidden; }
+div.slide { page-break-before: always }
+
+div.slide.first-slide { page-break-before: avoid }
+}
+
+
+.jslider table {
+margin-left: 0em;
+margin-right: 0em;
+}
+
+table.dataTable, .shiny-datatable-output div {
+font-size: 14pt;
+}
+
+.dataTables_info, .dataTables_paginate {
+font-size: 19px;
+}
+
+pre.sourceCode, code.sourceCode {
+font-size: 80%;
+}
+
+label, button, input, select, textarea {
+font-size: 14pt;
+}
+
+ul.nav, ul.nav li {
+list-style-type: none;
+}
+</style>
+  <script src="data:application/javascript;base64,/* slidy.js

   Copyright (c) 2005-2013 W3C (MIT, ERCIM, Keio), All Rights Reserved.
   W3C liability, trademark, document use and software licensing
   rules apply, see:

   http://www.w3.org/Consortium/Legal/copyright-documents
   http://www.w3.org/Consortium/Legal/copyright-software

   Defines single name "w3c_slidy" in global namespace
   Adds event handlers without trampling on any others
*/

// the slidy object implementation
var w3c_slidy = {
  // classify which kind of browser we're running under
  ns_pos: (typeof window.pageYOffset!='undefined'),
  khtml: ((navigator.userAgent).indexOf("KHTML") >= 0 ? true : false),
  opera: ((navigator.userAgent).indexOf("Opera") >= 0 ? true : false),
  ipad: ((navigator.userAgent).indexOf("iPad") >= 0 ? true : false),
  iphone: ((navigator.userAgent).indexOf("iPhone") >= 0 ? true : false),
  android: ((navigator.userAgent).indexOf("Android") >= 0 ? true : false),
  ie: (typeof document.all != "undefined" && !this.opera),
  ie6: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 6") != -1),
  ie7: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 7") != -1),
  ie8: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 8") != -1),
  ie9: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 9") != -1),

  // data for swipe and double tap detection on touch screens
  last_tap: 0,
  prev_tap: 0,
  start_x: 0,
  start_y: 0,
  delta_x: 0,
  delta_y: 0,

  // are we running as XHTML? (doesn't work on Opera)
  is_xhtml: /xml/.test(document.contentType),

  slide_number: 0, // integer slide count: 0, 1, 2, ...
  slide_number_element: null, // element containing slide number
  slides: [], // set to array of slide div's
  notes: [], // set to array of handout div's
  backgrounds: [], // set to array of background div's
  observers: [], // list of observer functions
  toolbar: null, // element containing toolbar
  title: null, // document title
  last_shown: null, // last incrementally shown item
  eos: null,  // span element for end of slide indicator
  toc: null, // table of contents
  outline: null, // outline element with the focus
  selected_text_len: 0, // length of drag selection on document
  view_all: 0,  // 1 to view all slides + handouts
  want_toolbar: true,  // user preference to show/hide toolbar
  mouse_click_enabled: true, // enables left click for next slide
  scroll_hack: 0, // IE work around for position: fixed
  disable_slide_click: false,  // used by clicked anchors

  lang: "en", // updated to language specified by html file

  help_anchor: null, // used for keyboard focus hack in showToolbar()
  help_page: "http://www.w3.org/Talks/Tools/Slidy2/help/help.html",
  help_text: "Navigate with mouse click, space bar, Cursor Left/Right, " +
             "or Pg Up and Pg Dn. Use S and B to change font size.",

  size_index: 0,
  size_adjustment: 0,
  sizes:  new Array("10pt", "12pt", "14pt", "16pt", "18pt", "20pt",
                    "22pt", "24pt", "26pt", "28pt", "30pt", "32pt"),

  // needed for efficient resizing
  last_width: 0,
  last_height: 0,


  // Needed for cross browser support for relative width/height on
  // object elements. The work around is to save width/height attributes
  // and then to recompute absolute width/height dimensions on resizing
   objects: [],

  // attach initialiation event handlers
  set_up: function () {
    var init = function() { w3c_slidy.init(); };
    if (typeof window.addEventListener != "undefined")
      window.addEventListener("load", init, false);
    else
      window.attachEvent("onload", init);
  },

  hide_slides: function () {
    if (document.body && !w3c_slidy.initialized)
      document.body.style.visibility = "hidden";
    else
      setTimeout(w3c_slidy.hide_slides, 50);
  },

  // hack to persuade IE to compute correct document height
  // as needed for simulating fixed positioning of toolbar
  ie_hack: function () {
    window.resizeBy(0,-1);
    window.resizeBy(0, 1);
  },

  init: function () {
    //alert("slidy starting test 10");
    document.body.style.visibility = "visible";
    this.init_localization();
    this.add_toolbar();
    this.wrap_implicit_slides();
    this.collect_slides();
    this.collect_notes();
    this.collect_backgrounds();
    this.objects = document.body.getElementsByTagName("object");
    this.patch_anchors();
    this.slide_number = this.find_slide_number(location.href);
    window.offscreenbuffering = true;
    this.size_adjustment = this.find_size_adjust();
    this.time_left = this.find_duration();
    this.hide_image_toolbar();  // suppress IE image toolbar popup
    this.init_outliner();  // activate fold/unfold support
    this.title = document.title;
    this.keyboardless = (this.ipad||this.iphone||this.android);

    if (this.keyboardless)
    {
      w3c_slidy.remove_class(w3c_slidy.toolbar, "hidden")
      this.want_toolbar = 0;
    }

    // work around for opera bug
    this.is_xhtml = (document.body.tagName == "BODY" ? false : true);

    if (this.slides.length > 0)
    {
      var slide = this.slides[this.slide_number];
   
      if (this.slide_number > 0)
      {
        this.set_visibility_all_incremental("visible");
        this.last_shown = this.previous_incremental_item(null);
        this.set_eos_status(true);
      }
      else
      {
        this.last_shown = null;
        this.set_visibility_all_incremental("hidden");
        this.set_eos_status(!this.next_incremental_item(this.last_shown));
      }

      this.set_location();
      this.add_class(this.slides[0], "first-slide");
      w3c_slidy.show_slide(slide);
    }

    this.toc = this.table_of_contents();

    this.add_initial_prompt();

    // bind event handlers without interfering with custom page scripts
    // Tap events behave too weirdly to support clicks reliably on
    // iPhone and iPad, so exclude these from click handler

    if (!this.keyboardless)
    {
      this.add_listener(document.body, "click", this.mouse_button_click);
      this.add_listener(document.body, "mousedown", this.mouse_button_down);
    }

    this.add_listener(document, "keydown", this.key_down);
    this.add_listener(document, "keypress", this.key_press);
    this.add_listener(window, "resize", this.resized);
    this.add_listener(window, "scroll", this.scrolled);
    this.add_listener(window, "unload", this.unloaded);

    this.add_listener(document, "gesturechange", function ()
    {
      return false;
    });

    this.attach_touch_handers(this.slides);

    // this seems to be a debugging hack
    //if (!document.body.onclick)
    //  document.body.onclick = function () { };

    this.single_slide_view();

    //this.set_location();

    this.resized();

    if (this.ie7)
      setTimeout(w3c_slidy.ie_hack, 100);

    this.show_toolbar();

    // for back button detection
    setInterval(function () { w3c_slidy.check_location(); }, 200);
    w3c_slidy.initialized = true;
  },

  // create div element with links to each slide
  table_of_contents: function () {
    var toc = this.create_element("div");
    this.add_class(toc, "slidy_toc hidden");
    //toc.setAttribute("tabindex", "0");

    var heading = this.create_element("div");
    this.add_class(heading, "toc-heading");
    heading.innerHTML = this.localize("Table of Contents");

    toc.appendChild(heading);
    var previous = null;

    for (var i = 0; i < this.slides.length; ++i)
    {
      var title = this.has_class(this.slides[i], "title");
      var num = document.createTextNode((i + 1) + ". ");

      toc.appendChild(num);

      var a = this.create_element("a");
      a.setAttribute("href", "#(" + (i+1) + ")");

      if (title)
        this.add_class(a, "titleslide");

      var name = document.createTextNode(this.slide_name(i));
      a.appendChild(name);
      a.onclick = w3c_slidy.toc_click;
      a.onkeydown = w3c_slidy.toc_key_down;
      a.previous = previous;

      if (previous)
        previous.next = a;

      toc.appendChild(a);

      if (i == 0)
        toc.first = a;

      if (i < this.slides.length - 1)
      {
        var br = this.create_element("br");
        toc.appendChild(br);
      }

      previous = a;
    }

    toc.focus = function () {
      if (this.first)
        this.first.focus();
    }

    toc.onmouseup = w3c_slidy.mouse_button_up;

    toc.onclick = function (e) {
      e||(e=window.event);

      if (w3c_slidy.selected_text_len <= 0)
         w3c_slidy.hide_table_of_contents(true);

      w3c_slidy.stop_propagation(e);
    
      if (e.cancel != undefined)
        e.cancel = true;
      
      if (e.returnValue != undefined)
        e.returnValue = false;
      
      return false;
    };

    document.body.insertBefore(toc, document.body.firstChild);
    return toc;
  },

  is_shown_toc: function () {
    return !w3c_slidy.has_class(w3c_slidy.toc, "hidden");
  },

  show_table_of_contents: function () {
    w3c_slidy.remove_class(w3c_slidy.toc, "hidden");
    var toc = w3c_slidy.toc;
    toc.focus();

    if (w3c_slidy.ie7 && w3c_slidy.slide_number == 0)
      setTimeout(w3c_slidy.ie_hack, 100);
  },

  hide_table_of_contents: function (focus) {
    w3c_slidy.add_class(w3c_slidy.toc, "hidden");

    if (focus && !w3c_slidy.opera &&
        !w3c_slidy.has_class(w3c_slidy.toc, "hidden"))
      w3c_slidy.set_focus();
  },

  toggle_table_of_contents: function () {
    if (w3c_slidy.is_shown_toc())
      w3c_slidy.hide_table_of_contents(true);
    else
      w3c_slidy.show_table_of_contents();
  },

  // called on clicking toc entry
  toc_click: function (e) {
    if (!e)
      e = window.event;

    var target = w3c_slidy.get_target(e);

    if (target && target.nodeType == 1)
    {
      var uri = target.getAttribute("href");

      if (uri)
      {
        //alert("going to " + uri);
        var slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.hide_slide(slide);
        w3c_slidy.slide_number = w3c_slidy.find_slide_number(uri);
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.last_shown = null;
        w3c_slidy.set_location();
        w3c_slidy.set_visibility_all_incremental("hidden");
        w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
        w3c_slidy.show_slide(slide);
        //target.focus();

        try
        {
          if (!w3c_slidy.opera)
            w3c_slidy.set_focus();
        }
        catch (e)
        {
        }
      }
    }

    w3c_slidy.hide_table_of_contents(true);
    if (w3c_slidy.ie7) w3c_slidy.ie_hack();
    w3c_slidy.stop_propagation(e);
    return w3c_slidy.cancel(e);
  },

  // called onkeydown for toc entry
  toc_key_down: function (event) {
    var key;

    if (!event)
      var event = window.event;

    // kludge around NS/IE differences 
    if (window.event)
      key = window.event.keyCode;
    else if (event.which)
      key = event.which;
    else
      return true; // Yikes! unknown browser

    // ignore event if key value is zero
    // as for alt on Opera and Konqueror
    if (!key)
      return true;

    // check for concurrent control/command/alt key
    // but are these only present on mouse events?

    if (event.ctrlKey || event.altKey)
      return true;

    if (key == 13)
    {
      var uri = this.getAttribute("href");

      if (uri)
      {
        //alert("going to " + uri);
       var slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.hide_slide(slide);
        w3c_slidy.slide_number = w3c_slidy.find_slide_number(uri);
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.last_shown = null;
        w3c_slidy.set_location();
        w3c_slidy.set_visibility_all_incremental("hidden");
        w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
        w3c_slidy.show_slide(slide);
        //target.focus();

        try
        {
          if (!w3c_slidy.opera)
            w3c_slidy.set_focus();
        }
        catch (e)
        {
        }
      }

      w3c_slidy.hide_table_of_contents(true);

      if (self.ie7)
       w3c_slidy.ie_hack();

      return w3c_slidy.cancel(event);
    }

    if (key == 40 && this.next)
    {
      this.next.focus();
      return w3c_slidy.cancel(event);
    }

    if (key == 38 && this.previous)
    {
      this.previous.focus();
      return w3c_slidy.cancel(event);
    }

    return true;
  },

  touchstart: function (e)
  {
    // a double touch often starts with a
    // single touch due to fingers touching
    // down at slightly different times
    // thus avoid calling preventDefault here
    this.prev_tap = this.last_tap;
    this.last_tap = (new Date).getTime();

    var tap_delay = this.last_tap - this.prev_tap;

    if (tap_delay <= 200)
    {
      // double tap
    }

    var touch = e.touches[0];

    this.pageX = touch.pageX;
    this.pageY = touch.pageY;
    this.screenX = touch.screenX;
    this.screenY = touch.screenY;
    this.clientX = touch.clientX;
    this.clientY = touch.clientY;

    this.delta_x = this.delta_y = 0;
  },

  touchmove: function (e)
  {
    // override native gestures for single touch
    if (e.touches.length > 1)
      return;

    e.preventDefault();
    var touch = e.touches[0];
    this.delta_x = touch.pageX - this.pageX;
    this.delta_y = touch.pageY - this.pageY;
  },

  touchend: function (e)
  {
    // default behavior for multi-touch
    if (e.touches.length > 1)
      return;

    var delay = (new Date).getTime() - this.last_tap;
    var dx = this.delta_x;
    var dy = this.delta_y;
    var abs_dx = Math.abs(dx);
    var abs_dy = Math.abs(dy);

    if (delay < 500 && (abs_dx > 100 || abs_dy > 100))
    {
      if (abs_dx > 0.5 * abs_dy)
      {
        e.preventDefault();

        if (dx < 0)
          w3c_slidy.next_slide(true);
        else
          w3c_slidy.previous_slide(true);
      }
      else if (abs_dy > 2 * abs_dx)
      {
        e.preventDefault();
        w3c_slidy.toggle_table_of_contents();
      }
    }
  },

  // ### OBSOLETE ###
  before_print: function () {
    this.show_all_slides();
    this.hide_toolbar();
    alert("before print");
  },

  // ### OBSOLETE ###
  after_print: function () {
    if (!this.view_all)
    {
      this.single_slide_view();
      this.show_toolbar();
    }
    alert("after print");
  },

  // ### OBSOLETE ###
  print_slides: function () {
    this.before_print();
    window.print();
    this.after_print();
  },

  // ### OBSOLETE ?? ###
  toggle_view: function () {
    if (this.view_all)
    {
      this.single_slide_view();
      this.show_toolbar();
      this.view_all = 0;
    }
    else
    {
      this.show_all_slides();
      this.hide_toolbar();
      this.view_all = 1;
    }
  },

  // prepare for printing  ### OBSOLETE ###
  show_all_slides: function () {
    this.remove_class(document.body, "single_slide");
    this.set_visibility_all_incremental("visible");
  },

  // restore after printing  ### OBSOLETE ###
  single_slide_view: function () {
    this.add_class(document.body, "single_slide");
    this.set_visibility_all_incremental("visible");
    this.last_shown = this.previous_incremental_item(null);
  },

  // suppress IE's image toolbar pop up
  hide_image_toolbar: function () {
    if (!this.ns_pos)
    {
      var images = document.getElementsByTagName("IMG");

      for (var i = 0; i < images.length; ++i)
        images[i].setAttribute("galleryimg", "no");
    }
  },

  unloaded: function (e) {
    //alert("unloaded");
  },

  // Safari and Konqueror don't yet support getComputedStyle()
  // and they always reload page when location.href is updated
  is_KHTML: function () {
    var agent = navigator.userAgent;
    return (agent.indexOf("KHTML") >= 0 ? true : false);
  },

  // find slide name from first h1 element
  // default to document title + slide number
  slide_name: function (index) {
    var name = null;
    var slide = this.slides[index];

    var heading = this.find_heading(slide);

    if (heading)
      name = this.extract_text(heading);

    if (!name)
      name = this.title + "(" + (index + 1) + ")";

    name.replace(/\&/g, "&amp;");
    name.replace(/\</g, "&lt;");
    name.replace(/\>/g, "&gt;");

    return name;
  },

  // find first h1 element in DOM tree
  find_heading: function (node) {
    if (!node || node.nodeType != 1)
      return null;

    if (node.nodeName == "H1" || node.nodeName == "h1")
      return node;

    var child = node.firstChild;

    while (child)
    {
      node = this.find_heading(child);

      if (node)
        return node;

      child = child.nextSibling;
    }

    return null;
  },

  // recursively extract text from DOM tree
  extract_text: function (node) {
    if (!node)
      return "";

    // text nodes
    if (node.nodeType == 3)
      return node.nodeValue;

    // elements
    if (node.nodeType == 1)
    {
      node = node.firstChild;
      var text = "";

      while (node)
      {
        text = text + this.extract_text(node);
        node = node.nextSibling;
      }

      return text;
    }

    return "";
  },

  // find copyright text from meta element
  find_copyright: function () {
    var name, content;
    var meta = document.getElementsByTagName("meta");

    for (var i = 0; i < meta.length; ++i)
    {
      name = meta[i].getAttribute("name");
      content = meta[i].getAttribute("content");

      if (name == "copyright")
        return content;
    }

    return null;
  },

  find_size_adjust: function () {
    var name, content, offset;
    var meta = document.getElementsByTagName("meta");

    for (var i = 0; i < meta.length; ++i)
    {
      name = meta[i].getAttribute("name");
      content = meta[i].getAttribute("content");

      if (name == "font-size-adjustment")
        return 1 * content;
    }

    return 1;
  },

  // <meta name="duration" content="20" />  for 20 minutes
  find_duration: function () {
    var name, content, offset;
    var meta = document.getElementsByTagName("meta");

    for (var i = 0; i < meta.length; ++i)
    {
      name = meta[i].getAttribute("name");
      content = meta[i].getAttribute("content");

      if (name == "duration")
        return 60000 * content;
    }

    return null;
  },

  replace_by_non_breaking_space: function (str) {
    for (var i = 0; i < str.length; ++i)
      str[i] = 160;
  },

  // ### CHECK ME ### is use of "li" okay for text/html?
  // for XHTML do we also need to specify namespace?
  init_outliner: function () {
    var items = document.getElementsByTagName("li");

    for (var i = 0; i < items.length; ++i)
    {
      var target = items[i];

      if (!this.has_class(target.parentNode, "outline"))
        continue;

      target.onclick = this.outline_click;
/* ### more work needed for IE6
      if (!this.ns_pos)
      {
        target.onmouseover = this.hover_outline;
        target.onmouseout = this.unhover_outline;
      }
*/
      if (this.foldable(target))
      {
        target.foldable = true;
        target.onfocus = function () {w3c_slidy.outline = this;};
        target.onblur = function () {w3c_slidy.outline = null;};

        if (!target.getAttribute("tabindex"))
          target.setAttribute("tabindex", "0");

        if (this.has_class(target, "expand"))
          this.unfold(target);
        else
          this.fold(target);
      }
      else
      {
        this.add_class(target, "nofold");
        target.visible = true;
        target.foldable = false;
      }
    }
  },

  foldable: function (item) {
    if (!item || item.nodeType != 1)
      return false;

    var node = item.firstChild;

    while (node)
    {
      if (node.nodeType == 1 && this.is_block(node))
        return true;

      node = node.nextSibling;
    }

    return false;
  },

  // ### CHECK ME ### switch to add/remove "hidden" class
  fold: function (item) {
    if (item)
    {
      this.remove_class(item, "unfolded");
      this.add_class(item, "folded");
    }

    var node = item ? item.firstChild : null;

    while (node)
    {
      if (node.nodeType == 1 && this.is_block(node)) // element
      {
         w3c_slidy.add_class(node, "hidden");
      }

      node = node.nextSibling;
    }

    item.visible = false;
  },

  // ### CHECK ME ### switch to add/remove "hidden" class
  unfold: function (item) {
    if (item)
    {
      this.add_class(item, "unfolded");
      this.remove_class(item, "folded");
    }

    var node = item ? item.firstChild : null;

    while (node)
    {
      if (node.nodeType == 1 && this.is_block(node)) // element
      {
        w3c_slidy.remove_class(node, "hidden");
      }

      node = node.nextSibling;
    }

    item.visible = true;
  },

  outline_click: function (e) {
    if (!e)
      e = window.event;

    var rightclick = false;
    var target = w3c_slidy.get_target(e);

    while (target && target.visible == undefined)
      target = target.parentNode;

    if (!target)
      return true;

    if (e.which)
      rightclick = (e.which == 3);
    else if (e.button)
      rightclick = (e.button == 2);

    if (!rightclick && target.visible != undefined)
    {
      if (target.foldable)
      {
        if (target.visible)
          w3c_slidy.fold(target);
        else
          w3c_slidy.unfold(target);
      }

      w3c_slidy.stop_propagation(e);
      e.cancel = true;
      e.returnValue = false;
    }

    return false;
  },

  add_initial_prompt: function () {
    var prompt = this.create_element("div");
    prompt.setAttribute("class", "initial_prompt");

    var p1 = this.create_element("p");
    prompt.appendChild(p1);
    p1.setAttribute("class", "help");

    if (this.keyboardless)
      p1.innerHTML = "swipe left to move to next slide";
    else
      p1.innerHTML = "Space, Right Arrow or swipe left to move to " +
                     "next slide, click help below for more details";

    this.add_listener(prompt, "click", function (e) {
      document.body.removeChild(prompt);
      w3c_slidy.stop_propagation(e);
    
      if (e.cancel != undefined)
        e.cancel = true;
      
      if (e.returnValue != undefined)
        e.returnValue = false;
      
      return false;
    });

    document.body.appendChild(prompt);
    this.initial_prompt = prompt;
    setTimeout(function() {document.body.removeChild(prompt);}, 5000);
  },

  add_toolbar: function () {
    var counter, page;

     this.toolbar = this.create_element("div");
     this.toolbar.setAttribute("class", "toolbar");

     // a reasonably behaved browser
     if (this.ns_pos || !this.ie6)
     {
       var right = this.create_element("div");
       right.setAttribute("style", "float: right; text-align: right");

       counter = this.create_element("span")
       counter.innerHTML = this.localize("slide") + " n/m";
       right.appendChild(counter);
       this.toolbar.appendChild(right);

       var left = this.create_element("div");
       left.setAttribute("style", "text-align: left");

       // global end of slide indicator
       this.eos = this.create_element("span");
       this.eos.innerHTML = "* ";
       left.appendChild(this.eos);

       var help = this.create_element("a");
       help.setAttribute("href", this.help_page);
       help.setAttribute("title", this.localize(this.help_text));
       help.innerHTML = this.localize("help?");
       left.appendChild(help);
       help.style.display="none"; 
       this.help_anchor = help;  // save for focus hack

       var gap1 = document.createTextNode(" ");
       left.appendChild(gap1);

       var contents = this.create_element("a");
       contents.setAttribute("href", "javascript:w3c_slidy.toggle_table_of_contents()");
       contents.setAttribute("title", this.localize("table of contents"));
       contents.innerHTML = this.localize("Contents");
       left.appendChild(contents);

       var gap2 = document.createTextNode(" ");
       left.appendChild(gap2);

       var copyright = this.find_copyright();

       if (copyright)
       {
         var span = this.create_element("span");
         span.className = "copyright";
         span.innerHTML = copyright;
         left.appendChild(span);
       }

       this.toolbar.setAttribute("tabindex", "0");
       this.toolbar.appendChild(left);
     }
     else // IE6 so need to work around its poor CSS support
     {
       this.toolbar.style.position = (this.ie7 ? "fixed" : "absolute");
       this.toolbar.style.zIndex = "200";
       this.toolbar.style.width = "99.9%";
       this.toolbar.style.height = "1.2em";
       this.toolbar.style.top = "auto";
       this.toolbar.style.bottom = "0";
       this.toolbar.style.left = "0";
       this.toolbar.style.right = "0";
       this.toolbar.style.textAlign = "left";
       this.toolbar.style.fontSize = "60%";
       this.toolbar.style.color = "red";
       this.toolbar.borderWidth = 0;
       this.toolbar.className = "toolbar";
       this.toolbar.style.background = "rgb(240,240,240)";

       // would like to have help text left aligned
       // and page counter right aligned, floating
       // div's don't work, so instead use nested
       // absolutely positioned div's.

       var sp = this.create_element("span");
       sp.innerHTML = "&nbsp;&nbsp;*&nbsp;";
       this.toolbar.appendChild(sp);
       this.eos = sp;  // end of slide indicator

       var help = this.create_element("a");
       help.setAttribute("href", this.help_page);
       help.setAttribute("title", this.localize(this.help_text));
       help.innerHTML = this.localize("help?");
       this.toolbar.appendChild(help);
       this.help_anchor = help;  // save for focus hack

       var gap1 = document.createTextNode(" ");
       this.toolbar.appendChild(gap1);

       var contents = this.create_element("a");
       contents.setAttribute("href", "javascript:toggleTableOfContents()");
       contents.setAttribute("title", this.localize("table of contents".localize));
       contents.innerHTML = this.localize("contents?");
       this.toolbar.appendChild(contents);

       var gap2 = document.createTextNode(" ");
       this.toolbar.appendChild(gap2);

       var copyright = this.find_copyright();

       if (copyright)
       {
         var span = this.create_element("span");
         span.innerHTML = copyright;
         span.style.color = "black";
         span.style.marginLeft = "0.5em";
         this.toolbar.appendChild(span);
       }

       counter = this.create_element("div")
       counter.style.position = "absolute";
       counter.style.width = "auto"; //"20%";
       counter.style.height = "1.2em";
       counter.style.top = "auto";
       counter.style.bottom = 0;
       counter.style.right = "0";
       counter.style.textAlign = "right";
       counter.style.color = "red";
       counter.style.background = "rgb(240,240,240)";

       counter.innerHTML = this.localize("slide") + " n/m";
       this.toolbar.appendChild(counter);
     }

     // ensure that click isn't passed through to the page
     this.toolbar.onclick =
         function (e) {
           if (!e)
             e = window.event;

           var target = e.target;

           if (!target && e.srcElement)
             target = e.srcElement;

           // work around Safari bug
           if (target && target.nodeType == 3)
             target = target.parentNode;

           w3c_slidy.stop_propagation(e);

           if (target && target.nodeName.toLowerCase() != "a")
             w3c_slidy.mouse_button_click(e);
         };

     this.slide_number_element = counter;
     this.set_eos_status(false);
     document.body.appendChild(this.toolbar);
  },

  // wysiwyg editors make it hard to use div elements
  // e.g. amaya loses the div when you copy and paste
  // this function wraps div elements around implicit
  // slides which start with an h1 element and continue
  // up to the next heading or div element
  wrap_implicit_slides: function () {
    var i, heading, node, next, div;
    var headings = document.getElementsByTagName("h1");

    if (!headings)
      return;

    for (i = 0; i < headings.length; ++i)
    {
      heading = headings[i];

      if (heading.parentNode != document.body)
        continue;

      node = heading.nextSibling;

      div = document.createElement("div");
      this.add_class(div, "slide");
      document.body.replaceChild(div, heading);
      div.appendChild(heading);

      while (node)
      {
        if (node.nodeType == 1) // an element
        {
           if (node.nodeName == "H1" || node.nodeName == "h1")
             break;

           if (node.nodeName == "DIV" || node.nodeName == "div")
           {
             if (this.has_class(node, "slide"))
               break;

             if (this.has_class(node, "handout"))
               break;
           }
        }

        next = node.nextSibling;
        node = document.body.removeChild(node);
        div.appendChild(node);
        node = next;
      } 
    }
  },

  attach_touch_handers: function(slides)
  {
    var i, slide;

    for (i = 0; i < slides.length; ++i)
    {
      slide = slides[i];
      this.add_listener(slide, "touchstart", this.touchstart);
      this.add_listener(slide, "touchmove", this.touchmove);
      this.add_listener(slide, "touchend", this.touchend);
    }
  },

// return new array of all slides
  collect_slides: function () {
    var slides = new Array();
    var divs = document.body.getElementsByTagName("div");

    for (var i = 0; i < divs.length; ++i)
    {
      div = divs.item(i);

      if (this.has_class(div, "slide"))
      {
        // add slide to collection
        slides[slides.length] = div;

        // hide each slide as it is found
        this.add_class(div, "hidden");

        // add dummy <br/> at end for scrolling hack
        var node1 = document.createElement("br");
        div.appendChild(node1);
        var node2 = document.createElement("br");
        div.appendChild(node2);
      }
      else if (this.has_class(div, "background"))
      {  // work around for Firefox SVG reload bug
        // which otherwise replaces 1st SVG graphic with 2nd
        div.style.display = "block";
      }
    }

    this.slides = slides;
  },

  // return new array of all <div class="handout">
  collect_notes: function () {
    var notes = new Array();
    var divs = document.body.getElementsByTagName("div");

    for (var i = 0; i < divs.length; ++i)
    {
      div = divs.item(i);

      if (this.has_class(div, "handout"))
      {
        // add note to collection
        notes[notes.length] = div;

        // and hide it
        this.add_class(div, "hidden");
      }
    }

    this.notes = notes;
  },

  // return new array of all <div class="background">
  // including named backgrounds e.g. class="background titlepage"
  collect_backgrounds: function () {
    var backgrounds = new Array();
    var divs = document.body.getElementsByTagName("div");

    for (var i = 0; i < divs.length; ++i)
    {
      div = divs.item(i);

      if (this.has_class(div, "background"))
      {
        // add background to collection
        backgrounds[backgrounds.length] = div;

        // and hide it
        this.add_class(div, "hidden");
      }
    }

    this.backgrounds = backgrounds;
  },

  // set click handlers on all anchors
  patch_anchors: function () {
    var self = w3c_slidy;
    var handler = function (event) {
      // compare this.href with location.href
      // for link to another slide in this doc

      if (self.page_address(this.href) == self.page_address(location.href))
      {
        // yes, so find new slide number
        var newslidenum = self.find_slide_number(this.href);

        if (newslidenum != self.slide_number)
        {
          var slide = self.slides[self.slide_number];
          self.hide_slide(slide);
          self.slide_number = newslidenum;
          slide = self.slides[self.slide_number];
          self.show_slide(slide);
          self.set_location();
        }
      }
      else
        w3c_slidy.stop_propagation(event);

//      else if (this.target == null)
//        location.href = this.href;

      this.blur();
      self.disable_slide_click = true;
    };

    var anchors = document.body.getElementsByTagName("a");

    for (var i = 0; i < anchors.length; ++i)
    {
      if (window.addEventListener)
        anchors[i].addEventListener("click", handler, false);
      else
        anchors[i].attachEvent("onclick", handler);
    }
  },

  // ### CHECK ME ### see which functions are invoked via setTimeout
  // either directly or indirectly for use of w3c_slidy vs this
  show_slide_number: function () {
    var timer = w3c_slidy.get_timer();
    w3c_slidy.slide_number_element.innerHTML = timer + w3c_slidy.localize("slide") + " " +
           (w3c_slidy.slide_number + 1) + "/" + w3c_slidy.slides.length;
  },

  // every 200mS check if the location has been changed as a
  // result of the user activating the Back button/menu item
  // doesn't work for Opera < 9.5
  check_location: function () {
    var hash = location.hash;

    if (w3c_slidy.slide_number > 0 && (hash == "" || hash == "#"))
      w3c_slidy.goto_slide(0);
    else if (hash.length > 2 && hash != "#("+(w3c_slidy.slide_number+1)+")")
    {
      var num = parseInt(location.hash.substr(2));

      if (!isNaN(num))
        w3c_slidy.goto_slide(num-1);
    }

    if (w3c_slidy.time_left && w3c_slidy.slide_number > 0)
    {
      w3c_slidy.show_slide_number();

      if (w3c_slidy.time_left > 0)
        w3c_slidy.time_left -= 200;
    } 
  },

  get_timer: function () {
    var timer = "";
    if (w3c_slidy.time_left)
    {
      var mins, secs;
      secs = Math.floor(w3c_slidy.time_left/1000);
      mins = Math.floor(secs / 60);
      secs = secs % 60;
      timer = (mins ? mins+"m" : "") + secs + "s ";
    }

    return timer;
  },

  // this doesn't push location onto history stack for IE
  // for which a hidden iframe hack is needed: load page into
  // the iframe with script that set's parent's location.hash
  // but that won't work for standalone use unless we can
  // create the page dynamically via a javascript: URL
  // ### use history.pushState if available
  set_location: function () {
     var uri = w3c_slidy.page_address(location.href);
     var hash = "#(" + (w3c_slidy.slide_number+1) + ")";

     if (w3c_slidy.slide_number >= 0)
       uri = uri + hash;

     if (typeof(history.pushState) != "undefined" && location.protocol !== "file:")
     {
       document.title = w3c_slidy.title + " (" + (w3c_slidy.slide_number+1) + ")";
       history.pushState(0, document.title, hash);
       w3c_slidy.show_slide_number();
       w3c_slidy.notify_observers();
       return;
     }

     if (w3c_slidy.ie && (w3c_slidy.ie6 || w3c_slidy.ie7))
       w3c_slidy.push_hash(hash);

     if (uri != location.href) // && !khtml
        location.href = uri;

     if (this.khtml)
        hash = "(" + (w3c_slidy.slide_number+1) + ")";

     if (!this.ie && location.hash != hash && location.hash != "")
       location.hash = hash;

     document.title = w3c_slidy.title + " (" + (w3c_slidy.slide_number+1) + ")";
     w3c_slidy.show_slide_number();
     w3c_slidy.notify_observers();
  },

  notify_observers: function ()
  {
    var slide = this.slides[this.slide_number];

    for (var i = 0; i < this.observers.length; ++i)
      this.observers[i](this.slide_number+1, this.find_heading(slide).innerText, location.href);
  },

  add_observer: function (observer)
  {
    for (var i = 0; i < this.observers.length; ++i)
    {
      if (observer == this.observers[i])
        return;
    }

    this.observers.push(observer);
  },

  remove_observer: function (o)
  {
    for (var i = 0; i < this.observers.length; ++i)
    {
      if (observer == this.observers[i])
      {
        this.observers.splice(i,1);
        break;
      }
    }
  },

  page_address: function (uri) {
    var i = uri.indexOf("#");

    if (i < 0)
      i = uri.indexOf("%23");

    // check if anchor is entire page

    if (i < 0)
      return uri;  // yes

    return uri.substr(0, i);
  },

  // only used for IE6 and IE7
  on_frame_loaded: function (hash) {
    location.hash = hash;
    var uri = w3c_slidy.page_address(location.href);
    location.href = uri + hash;
  },

  // history hack with thanks to Bertrand Le Roy
  push_hash: function (hash) {
    if (hash == "") hash = "#(1)";
      window.location.hash = hash;

    var doc = document.getElementById("historyFrame").contentWindow.document;
    doc.open("javascript:'<html></html>'");
    doc.write("<html><head><script type=\"text/javascript\">window.parent.w3c_slidy.on_frame_loaded('"+
      (hash) + "');</script></head><body>hello mum</body></html>");
      doc.close();
  },

  // find current slide based upon location
  // first find target anchor and then look
  // for associated div element enclosing it
  // finally map that to slide number
  find_slide_number: function (uri) {
    // first get anchor from page location

    var i = uri.indexOf("#");

    // check if anchor is entire page
    if (i < 0)
      return 0;  // yes

    var anchor = unescape(uri.substr(i+1));

    // now use anchor as XML ID to find target
    var target = document.getElementById(anchor);

    if (!target)
    {
      // does anchor look like "(2)" for slide 2 ??
      // where first slide is (1)
      var re = /\((\d)+\)/;

      if (anchor.match(re))
      {
        var num = parseInt(anchor.substring(1, anchor.length-1));

        if (num > this.slides.length)
          num = 1;

        if (--num < 0)
          num = 0;

        return num;
      }

      // accept [2] for backwards compatibility
      re = /\[(\d)+\]/;

      if (anchor.match(re))
      {
         var num = parseInt(anchor.substring(1, anchor.length-1));

         if (num > this.slides.length)
            num = 1;

         if (--num < 0)
            num = 0;

         return num;
      }

      // oh dear unknown anchor
      return 0;
    }

    // search for enclosing slide

    while (true)
    {
      // browser coerces html elements to uppercase!
      if (target.nodeName.toLowerCase() == "div" &&
            this.has_class(target, "slide"))
      {
        // found the slide element
        break;
      }

      // otherwise try parent element if any

      target = target.parentNode;

      if (!target)
      {
        return 0;   // no luck!
      }
    };

    for (i = 0; i < slides.length; ++i)
    {
      if (slides[i] == target)
        return i;  // success
    }

    // oh dear still no luck
    return 0;
  },

  previous_slide: function (incremental) {
    if (!w3c_slidy.view_all)
    {
      var slide;

      if ((incremental || w3c_slidy.slide_number == 0) && w3c_slidy.last_shown != null)
      {
        w3c_slidy.last_shown = w3c_slidy.hide_previous_item(w3c_slidy.last_shown);
        w3c_slidy.set_eos_status(false);
      }
      else if (w3c_slidy.slide_number > 0)
      {
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.hide_slide(slide);

        w3c_slidy.slide_number = w3c_slidy.slide_number - 1;
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.set_visibility_all_incremental("visible");
        w3c_slidy.last_shown = w3c_slidy.previous_incremental_item(null);
        w3c_slidy.set_eos_status(true);
        w3c_slidy.show_slide(slide);
      }

      w3c_slidy.set_location();

      if (!w3c_slidy.ns_pos)
        w3c_slidy.refresh_toolbar(200);
    }
  },

  next_slide: function (incremental) {
    if (!w3c_slidy.view_all)
    {
      var slide, last = w3c_slidy.last_shown;

      if (incremental || w3c_slidy.slide_number == w3c_slidy.slides.length - 1)
         w3c_slidy.last_shown = w3c_slidy.reveal_next_item(w3c_slidy.last_shown);

      if ((!incremental || w3c_slidy.last_shown == null) &&
             w3c_slidy.slide_number < w3c_slidy.slides.length - 1)
      {
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);

         w3c_slidy.slide_number = w3c_slidy.slide_number + 1;
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.last_shown = null;
         w3c_slidy.set_visibility_all_incremental("hidden");
         w3c_slidy.show_slide(slide);
      }
      else if (!w3c_slidy.last_shown)
      {
         if (last && incremental)
           w3c_slidy.last_shown = last;
      }

      w3c_slidy.set_location();

      w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));

      if (!w3c_slidy.ns_pos)
         w3c_slidy.refresh_toolbar(200);
     }
  },

  // to first slide with nothing revealed
  // i.e. state at start of presentation
  first_slide: function () {
     if (!w3c_slidy.view_all)
     {
       var slide;

       if (w3c_slidy.slide_number != 0)
       {
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);

         w3c_slidy.slide_number = 0;
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.last_shown = null;
         w3c_slidy.set_visibility_all_incremental("hidden");
         w3c_slidy.show_slide(slide);
       }

       w3c_slidy.set_eos_status(
         !w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
       w3c_slidy.set_location();
     }
  },

  // goto last slide with everything revealed
  // i.e. state at end of presentation
  last_slide: function () {
    if (!w3c_slidy.view_all)
    {
      var slide;

      w3c_slidy.last_shown = null; //revealNextItem(lastShown);

      if (w3c_slidy.last_shown == null &&
          w3c_slidy.slide_number < w3c_slidy.slides.length - 1)
      {
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);
         w3c_slidy.slide_number = w3c_slidy.slides.length - 1;
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.set_visibility_all_incremental("visible");
         w3c_slidy.last_shown = w3c_slidy.previous_incremental_item(null);

         w3c_slidy.show_slide(slide);
      }
      else
      {
         w3c_slidy.set_visibility_all_incremental("visible");
         w3c_slidy.last_shown = w3c_slidy.previous_incremental_item(null);
      }

      w3c_slidy.set_eos_status(true);
      w3c_slidy.set_location();
    }
  },


  // ### check this and consider add/remove class
  set_eos_status: function (state) {
    if (this.eos)
      this.eos.style.color = (state ? "rgb(240,240,240)" : "red");
  },

  // first slide is 0
  goto_slide: function (num) {
    //alert("going to slide " + (num+1));
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.hide_slide(slide);
    w3c_slidy.slide_number = num;
    slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.last_shown = null;
    w3c_slidy.set_visibility_all_incremental("hidden");
    w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
    document.title = w3c_slidy.title + " (" + (w3c_slidy.slide_number+1) + ")";
    w3c_slidy.show_slide(slide);
    w3c_slidy.show_slide_number();
  },


  show_slide: function (slide) {
    this.sync_background(slide);
    this.remove_class(slide, "hidden");

    // work around IE9 object rendering bug
    setTimeout("window.scrollTo(0,0);", 1);
  },

  hide_slide: function (slide) {
    this.add_class(slide, "hidden");
  },

  set_focus: function (element)
  {
    if (element)
      element.focus();
    else
    {
      w3c_slidy.help_anchor.focus();

      setTimeout(function() {
        w3c_slidy.help_anchor.blur();
      }, 1);
    }
  },

  // show just the backgrounds pertinent to this slide
  // when slide background-color is transparent
  // this should now work with rgba color values
  sync_background: function (slide) {
    var background;
    var bgColor;

    if (slide.currentStyle)
      bgColor = slide.currentStyle["backgroundColor"];
    else if (document.defaultView)
    {
      var styles = document.defaultView.getComputedStyle(slide,null);

      if (styles)
        bgColor = styles.getPropertyValue("background-color");
      else // broken implementation probably due Safari or Konqueror
      {
        //alert("defective implementation of getComputedStyle()");
        bgColor = "transparent";
      }
    }
    else
      bgColor == "transparent";

    if (bgColor == "transparent" ||
        bgColor.indexOf("rgba") >= 0 ||
        bgColor.indexOf("opacity") >= 0)
    {
      var slideClass = this.get_class_list(slide);

      for (var i = 0; i < this.backgrounds.length; i++)
      {
        background = this.backgrounds[i];

        var bgClass = this.get_class_list(background);

        if (this.matching_background(slideClass, bgClass))
          this.remove_class(background, "hidden");
        else
          this.add_class(background, "hidden");
      }
    }
    else // forcibly hide all backgrounds
      this.hide_backgrounds();
  },

  hide_backgrounds: function () {
    for (var i = 0; i < this.backgrounds.length; i++)
    {
      background = this.backgrounds[i];
      this.add_class(background, "hidden");
    }
  },

  // compare classes for slide and background
  matching_background: function (slideClass, bgClass) {
    var i, count, pattern, result;

    // define pattern as regular expression
    pattern = /\w+/g;

    // check background class names
    result = bgClass.match(pattern);

    for (i = count = 0; i < result.length; i++)
    {
      if (result[i] == "hidden")
        continue;

      if (result[i] == "background")
	continue;

      ++count;
    }

    if (count == 0)  // default match
      return true;

    // check for matches and place result in array
    result = slideClass.match(pattern);

    // now check if desired name is present for background
    for (i = count = 0; i < result.length; i++)
    {
      if (result[i] == "hidden")
        continue;

      if (this.has_token(bgClass, result[i]))
        return true;
    }

    return false;
  },

  resized: function () {
     var width = 0;

     if ( typeof( window.innerWidth ) == 'number' )
       width = window.innerWidth;  // Non IE browser
     else if (document.documentElement && document.documentElement.clientWidth)
       width = document.documentElement.clientWidth;  // IE6
     else if (document.body && document.body.clientWidth)
       width = document.body.clientWidth; // IE4

     var height = 0;

     if ( typeof( window.innerHeight ) == 'number' )
       height = window.innerHeight;  // Non IE browser
     else if (document.documentElement && document.documentElement.clientHeight)
       height = document.documentElement.clientHeight;  // IE6
     else if (document.body && document.body.clientHeight)
       height = document.body.clientHeight; // IE4

     if (height && (width/height > 1.05*1024/768))
     {
       width = height * 1024.0/768;
     }

     // IE fires onresize even when only font size is changed!
     // so we do a check to avoid blocking < and > actions
     if (width != w3c_slidy.last_width || height != w3c_slidy.last_height)
     {
       if (width >= 1100)
         w3c_slidy.size_index = 5;    // 4
       else if (width >= 1000)
         w3c_slidy.size_index = 4;    // 3
       else if (width >= 800)
         w3c_slidy.size_index = 3;    // 2
       else if (width >= 600)
         w3c_slidy.size_index = 2;    // 1
       else if (width)
         w3c_slidy.size_index = 0;

       // add in font size adjustment from meta element e.g.
       // <meta name="font-size-adjustment" content="-2" />
       // useful when slides have too much content ;-)

       if (0 <= w3c_slidy.size_index + w3c_slidy.size_adjustment &&
             w3c_slidy.size_index + w3c_slidy.size_adjustment < w3c_slidy.sizes.length)
         w3c_slidy.size_index = w3c_slidy.size_index + w3c_slidy.size_adjustment;

       // enables cross browser use of relative width/height
       // on object elements for use with SVG and Flash media
       w3c_slidy.adjust_object_dimensions(width, height);

       if (document.body.style.fontSize != w3c_slidy.sizes[w3c_slidy.size_index])
       {
         document.body.style.fontSize = w3c_slidy.sizes[w3c_slidy.size_index];
       }

       w3c_slidy.last_width = width;
       w3c_slidy.last_height = height;

       // force reflow to work around Mozilla bug
       if (w3c_slidy.ns_pos)
       {
         var slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);
         w3c_slidy.show_slide(slide);
       }

       // force correct positioning of toolbar
       w3c_slidy.refresh_toolbar(200);
     }
  },

  scrolled: function () {
    if (w3c_slidy.toolbar && !w3c_slidy.ns_pos && !w3c_slidy.ie7)
    {
      w3c_slidy.hack_offset = w3c_slidy.scroll_x_offset();
      // hide toolbar
      w3c_slidy.toolbar.style.display = "none";

      // make it reappear later
      if (w3c_slidy.scrollhack == 0 && !w3c_slidy.view_all)
      {
        setTimeout(function () {w3c_slidy.show_toolbar(); }, 1000);
        w3c_slidy.scrollhack = 1;
      }
    }
  },

  hide_toolbar: function () {
    w3c_slidy.add_class(w3c_slidy.toolbar, "hidden");
    window.focus();
  },

  // used to ensure IE refreshes toolbar in correct position
  refresh_toolbar: function (interval) {
    if (!w3c_slidy.ns_pos && !w3c_slidy.ie7)
    {
      w3c_slidy.hide_toolbar();
      setTimeout(function () {w3c_slidy.show_toolbar();}, interval);
    }
  },

  // restores toolbar after short delay
  show_toolbar: function () {
    if (w3c_slidy.want_toolbar)
    {
      w3c_slidy.toolbar.style.display = "block";

      if (!w3c_slidy.ns_pos)
      {
        // adjust position to allow for scrolling
        var xoffset = w3c_slidy.scroll_x_offset();
        w3c_slidy.toolbar.style.left = xoffset;
        w3c_slidy.toolbar.style.right = xoffset;

        // determine vertical scroll offset
        //var yoffset = scrollYOffset();

        // bottom is doc height - window height - scroll offset
        //var bottom = documentHeight() - lastHeight - yoffset

        //if (yoffset > 0 || documentHeight() > lastHeight)
        //   bottom += 16;  // allow for height of scrollbar

        w3c_slidy.toolbar.style.bottom = 0; //bottom;
      }

      w3c_slidy.remove_class(w3c_slidy.toolbar, "hidden");
    }

    w3c_slidy.scrollhack = 0;


    // set the keyboard focus to the help link on the
    // toolbar to ensure that document has the focus
    // IE doesn't always work with window.focus()
    // and this hack has benefit of Enter for help

    try
    {
      if (!w3c_slidy.opera)
        w3c_slidy.set_focus();
    }
    catch (e)
    {
    }
  },

// invoked via F key
  toggle_toolbar: function () {
    if (!w3c_slidy.view_all)
    {
      if (w3c_slidy.has_class(w3c_slidy.toolbar, "hidden"))
      {
        w3c_slidy.remove_class(w3c_slidy.toolbar, "hidden")
        w3c_slidy.want_toolbar = 1;
      }
      else
      {
        w3c_slidy.add_class(w3c_slidy.toolbar, "hidden")
        w3c_slidy.want_toolbar = 0;
      }
    }
  },

  scroll_x_offset: function () {
    if (window.pageXOffset)
      return self.pageXOffset;

    if (document.documentElement && 
             document.documentElement.scrollLeft)
      return document.documentElement.scrollLeft;

    if (document.body)
      return document.body.scrollLeft;

    return 0;
  },

  scroll_y_offset: function () {
    if (window.pageYOffset)
      return self.pageYOffset;

    if (document.documentElement && 
             document.documentElement.scrollTop)
      return document.documentElement.scrollTop;

    if (document.body)
      return document.body.scrollTop;

    return 0;
  },

  // looking for a way to determine height of slide content
  // the slide itself is set to the height of the window
  optimize_font_size: function () {
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];

    //var dh = documentHeight(); //getDocHeight(document);
    var dh = slide.scrollHeight;
    var wh = getWindowHeight();
    var u = 100 * dh / wh;

    alert("window utilization = " + u + "% (doc "
      + dh + " win " + wh + ")");
  },

  // from document object
  get_doc_height: function (doc) {
    if (!doc)
      doc = document;

    if (doc && doc.body && doc.body.offsetHeight)
      return doc.body.offsetHeight;  // ns/gecko syntax

    if (doc && doc.body && doc.body.scrollHeight)
      return doc.body.scrollHeight;

    alert("couldn't determine document height");
  },

  get_window_height: function () {
    if ( typeof( window.innerHeight ) == 'number' )
      return window.innerHeight;  // Non IE browser

    if (document.documentElement && document.documentElement.clientHeight)
      return document.documentElement.clientHeight;  // IE6

    if (document.body && document.body.clientHeight)
      return document.body.clientHeight; // IE4
  },

  document_height: function () {
    var sh, oh;

    sh = document.body.scrollHeight;
    oh = document.body.offsetHeight;

    if (sh && oh)
    {
      return (sh > oh ? sh : oh);
    }

    // no idea!
    return 0;
  },

  smaller: function () {
    if (w3c_slidy.size_index > 0)
    {
      --w3c_slidy.size_index;
    }

    w3c_slidy.toolbar.style.display = "none";
    document.body.style.fontSize = w3c_slidy.sizes[w3c_slidy.size_index];
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.hide_slide(slide);
    w3c_slidy.show_slide(slide);
    setTimeout(function () {w3c_slidy.show_toolbar(); }, 50);
  },

  bigger: function () {
    if (w3c_slidy.size_index < w3c_slidy.sizes.length - 1)
    {
      ++w3c_slidy.size_index;
    }

    w3c_slidy.toolbar.style.display = "none";
    document.body.style.fontSize = w3c_slidy.sizes[w3c_slidy.size_index];
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.hide_slide(slide);
    w3c_slidy.show_slide(slide);
    setTimeout(function () {w3c_slidy.show_toolbar(); }, 50);
  },

  // enables cross browser use of relative width/height
  // on object elements for use with SVG and Flash media
  // with thanks to Ivan Herman for the suggestion
  adjust_object_dimensions: function (width, height) {
    for( var i = 0; i < w3c_slidy.objects.length; i++ )
    {
      var obj = this.objects[i];
      var mimeType = obj.getAttribute("type");

      if (mimeType == "image/svg+xml" || mimeType == "application/x-shockwave-flash")
      {
        if ( !obj.initialWidth ) 
          obj.initialWidth = obj.getAttribute("width");

        if ( !obj.initialHeight ) 
          obj.initialHeight = obj.getAttribute("height");

        if ( obj.initialWidth && obj.initialWidth.charAt(obj.initialWidth.length-1) == "%" )
        {
          var w = parseInt(obj.initialWidth.slice(0, obj.initialWidth.length-1));
          var newW = width * (w/100.0);
          obj.setAttribute("width",newW);
        }

        if ( obj.initialHeight &&
             obj.initialHeight.charAt(obj.initialHeight.length-1) == "%" )
        {
          var h = parseInt(obj.initialHeight.slice(0, obj.initialHeight.length-1));
          var newH = height * (h/100.0);
          obj.setAttribute("height", newH);
        }
      }
    }
  },

  // needed for Opera to inhibit default behavior
  // since Opera delivers keyPress even if keyDown
  // was cancelled
  key_press: function (event) {
    if (!event)
      event = window.event;

    if (!w3c_slidy.key_wanted)
      return w3c_slidy.cancel(event);

    return true;
  },

  //  See e.g. http://www.quirksmode.org/js/events/keys.html for keycodes
  key_down: function (event) {
    var key, target, tag;

    w3c_slidy.key_wanted = true;

    if (!event)
      event = window.event;

    // kludge around NS/IE differences 
    if (window.event)
    {
      key = window.event.keyCode;
      target = window.event.srcElement;
    }
    else if (event.which)
    {
      key = event.which;
      target = event.target;
    }
    else
      return true; // Yikes! unknown browser

    // ignore event if key value is zero
    // as for alt on Opera and Konqueror
    if (!key)
       return true;

    // avoid interfering with keystroke
    // behavior for non-slidy chrome elements
    if (!w3c_slidy.slidy_chrome(target) &&
        w3c_slidy.special_element(target))
      return true;

    // check for concurrent control/command/alt key
    // but are these only present on mouse events?

    if (event.ctrlKey || event.altKey || event.metaKey)
       return true;

    // dismiss table of contents if visible
    if (w3c_slidy.is_shown_toc() && key != 9 && key != 16 && key != 38 && key != 40)
    {
      w3c_slidy.hide_table_of_contents(true);

      if (key == 27 || key == 84 || key == 67)
        return w3c_slidy.cancel(event);
    }

    if (key == 34) // Page Down
    {
      if (w3c_slidy.view_all)
        return true;

      w3c_slidy.next_slide(false);
      return w3c_slidy.cancel(event);
    }
    else if (key == 33) // Page Up
    {
      if (w3c_slidy.view_all)
        return true;

      w3c_slidy.previous_slide(false);
      return w3c_slidy.cancel(event);
    }
    else if (key == 32) // space bar
    {
      w3c_slidy.next_slide(true);
      return w3c_slidy.cancel(event);
    }
    else if (key == 37) // Left arrow
    {
      w3c_slidy.previous_slide(!event.shiftKey);
      return w3c_slidy.cancel(event);
    }
    else if (key == 36) // Home
    {
      w3c_slidy.first_slide();
      return w3c_slidy.cancel(event);
    }
    else if (key == 35) // End
    {
      w3c_slidy.last_slide();
      return w3c_slidy.cancel(event);
    }
    else if (key == 39) // Right arrow
    {
      w3c_slidy.next_slide(!event.shiftKey);
      return w3c_slidy.cancel(event);
    }
    else if (key == 13) // Enter
    {
      if (w3c_slidy.outline)
      {
        if (w3c_slidy.outline.visible)
          w3c_slidy.fold(w3c_slidy.outline);
        else
          w3c_slidy.unfold(w3c_slidy.outline);
          
       return w3c_slidy.cancel(event);
      }
    }
    else if (key == 188)  // < for smaller fonts
    {
      w3c_slidy.smaller();
      return w3c_slidy.cancel(event);
    }
    else if (key == 190)  // > for larger fonts
    {
      w3c_slidy.bigger();
      return w3c_slidy.cancel(event);
    }
    else if (key == 189 || key == 109)  // - for smaller fonts
    {
      w3c_slidy.smaller();
      return w3c_slidy.cancel(event);
    }
    else if (key == 187 || key == 191 || key == 107)  // = +  for larger fonts
    {
      w3c_slidy.bigger();
      return w3c_slidy.cancel(event);
    }
    else if (key == 83)  // S for smaller fonts
    {
      w3c_slidy.smaller();
      return w3c_slidy.cancel(event);
    }
    else if (key == 66)  // B for larger fonts
    {
      w3c_slidy.bigger();
      return w3c_slidy.cancel(event);
    }
    else if (key == 90)  // Z for last slide
    {
      w3c_slidy.last_slide();
      return w3c_slidy.cancel(event);
    }
    else if (key == 70)  // F for toggle toolbar
    {
      w3c_slidy.toggle_toolbar();
      return w3c_slidy.cancel(event);
    }
    else if (key == 65)  // A for toggle view single/all slides
    {
      w3c_slidy.toggle_view();
      return w3c_slidy.cancel(event);
    }
    else if (key == 75)  // toggle action of left click for next page
    {
      w3c_slidy.mouse_click_enabled = !w3c_slidy.mouse_click_enabled;
      var alert_msg = (w3c_slidy.mouse_click_enabled ?
                "enabled" : "disabled") +  " mouse click advance";

      alert(w3c_slidy.localize(alert_msg));
      return w3c_slidy.cancel(event);
    }
    else if (key == 84 || key == 67)  // T or C for table of contents
    {
      if (w3c_slidy.toc)
        w3c_slidy.toggle_table_of_contents();

      return w3c_slidy.cancel(event);
    }
    else if (key == 72) // H for help
    {
      window.location = w3c_slidy.help_page;
      return w3c_slidy.cancel(event);
    }
    //else alert("key code is "+ key);

    return true;
  },

  // safe for both text/html and application/xhtml+xml
  create_element: function (name) {
    if (this.xhtml && (typeof document.createElementNS != 'undefined'))
      return document.createElementNS("http://www.w3.org/1999/xhtml", name)

    return document.createElement(name);
  },

  get_element_style: function (elem, IEStyleProp, CSSStyleProp) {
    if (elem.currentStyle)
    {
      return elem.currentStyle[IEStyleProp];
    }
    else if (window.getComputedStyle)
    {
      var compStyle = window.getComputedStyle(elem, "");
      return compStyle.getPropertyValue(CSSStyleProp);
    }
    return "";
  },

  // the string str is a whitespace separated list of tokens
  // test if str contains a particular token, e.g. "slide"
  has_token: function (str, token) {
    if (str)
    {
      // define pattern as regular expression
      var pattern = /\w+/g;

      // check for matches
      // place result in array
      var result = str.match(pattern);

      // now check if desired token is present
      for (var i = 0; i < result.length; i++)
      {
        if (result[i] == token)
          return true;
      }
    }

    return false;
  },

  get_class_list: function (element) {
    if (typeof element.className != 'undefined')
      return element.className;

    return element.getAttribute("class");
  },

  has_class: function (element, name) {
    if (element.nodeType != 1)
      return false;

    var regexp = new RegExp("(^| )" + name + "\W*");

    if (typeof element.className != 'undefined')
      return regexp.test(element.className);

    return regexp.test(element.getAttribute("class"));
  },

  remove_class: function (element, name) {
    var regexp = new RegExp("(^| )" + name + "\W*");
    var clsval = "";

    if (typeof element.className != 'undefined')
    {
      clsval = element.className;

      if (clsval)
      {
        clsval = clsval.replace(regexp, "");
        element.className = clsval;
      }
    }
    else
    {
      clsval = element.getAttribute("class");

      if (clsval)
      {
        clsval = clsval.replace(regexp, "");
        element.setAttribute("class", clsval);
      }
    }
  },

  add_class: function (element, name) {
    if (!this.has_class(element, name))
    {
      if (typeof element.className != 'undefined')
        element.className += " " + name;
      else
      {
        var clsval = element.getAttribute("class");
        clsval = clsval ? clsval + " " + name : name;
        element.setAttribute("class", clsval);
      }
    }
  },

  // HTML elements that can be used with class="incremental"
  // note that you can also put the class on containers like
  // up, ol, dl, and div to make their contents appear
  // incrementally. Upper case is used since this is what
  // browsers report for HTML node names (text/html).
  incremental_elements: null,
  okay_for_incremental: function (name) {
    if (!this.incremental_elements)
    {
      var inclist = new Array();
      inclist["p"] = true;
      inclist["pre"] = true;
      inclist["li"] = true;
      inclist["blockquote"] = true;
      inclist["dt"] = true;
      inclist["dd"] = true;
      inclist["h2"] = true;
      inclist["h3"] = true;
      inclist["h4"] = true;
      inclist["h5"] = true;
      inclist["h6"] = true;
      inclist["span"] = true;
      inclist["address"] = true;
      inclist["table"] = true;
      inclist["tr"] = true;
      inclist["th"] = true;
      inclist["td"] = true;
      inclist["img"] = true;
      inclist["object"] = true;
      this.incremental_elements = inclist;
    }
    return this.incremental_elements[name.toLowerCase()];
  },

  next_incremental_item: function (node) {
    var br = this.is_xhtml ? "br" : "BR";
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];

    for (;;)
    {
      node = w3c_slidy.next_node(slide, node);

      if (node == null || node.parentNode == null)
        break;

      if (node.nodeType == 1)  // ELEMENT
      {
        if (node.nodeName == br)
          continue;

        if (w3c_slidy.has_class(node, "incremental")
             && w3c_slidy.okay_for_incremental(node.nodeName))
          return node;

        if (w3c_slidy.has_class(node.parentNode, "incremental")
             && !w3c_slidy.has_class(node, "non-incremental"))
          return node;
      }
    }

    return node;
  },

  previous_incremental_item: function (node) {
    var br = this.is_xhtml ? "br" : "BR";
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];

    for (;;)
    {
      node = w3c_slidy.previous_node(slide, node);

      if (node == null || node.parentNode == null)
        break;

      if (node.nodeType == 1)
      {
        if (node.nodeName == br)
          continue;

        if (w3c_slidy.has_class(node, "incremental")
             && w3c_slidy.okay_for_incremental(node.nodeName))
          return node;

        if (w3c_slidy.has_class(node.parentNode, "incremental")
             && !w3c_slidy.has_class(node, "non-incremental"))
          return node;
      }
    }

    return node;
  },

  // set visibility for all elements on current slide with
  // a parent element with attribute class="incremental"
  set_visibility_all_incremental: function (value) {
    var node = this.next_incremental_item(null);

    if (value == "hidden")
    {
      while (node)
      {
        w3c_slidy.add_class(node, "invisible");
        node = w3c_slidy.next_incremental_item(node);
      }
    }
    else // value == "visible"
    {
      while (node)
      {
        w3c_slidy.remove_class(node, "invisible");
        node = w3c_slidy.next_incremental_item(node);
      }
    }
  },

  // reveal the next hidden item on the slide
  // node is null or the node that was last revealed
  reveal_next_item: function (node) {
    node = w3c_slidy.next_incremental_item(node);

    if (node && node.nodeType == 1)  // an element
      w3c_slidy.remove_class(node, "invisible");

    return node;
  },

  // exact inverse of revealNextItem(node)
  hide_previous_item: function (node) {
    if (node && node.nodeType == 1)  // an element
      w3c_slidy.add_class(node, "invisible");

    return this.previous_incremental_item(node);
  },

  // left to right traversal of root's content
  next_node: function (root, node) {
    if (node == null)
      return root.firstChild;

    if (node.firstChild)
      return node.firstChild;

    if (node.nextSibling)
      return node.nextSibling;

    for (;;)
    {
      node = node.parentNode;

      if (!node || node == root)
        break;

      if (node && node.nextSibling)
        return node.nextSibling;
    }

    return null;
  },

  // right to left traversal of root's content
  previous_node: function (root, node) {
    if (node == null)
    {
      node = root.lastChild;

      if (node)
      {
        while (node.lastChild)
          node = node.lastChild;
      }

      return node;
    }

    if (node.previousSibling)
    {
      node = node.previousSibling;

      while (node.lastChild)
        node = node.lastChild;

      return node;
    }

    if (node.parentNode != root)
      return node.parentNode;

    return null;
  },

  previous_sibling_element: function (el) {
    el = el.previousSibling;

    while (el && el.nodeType != 1)
      el = el.previousSibling;

    return el;
  },

  next_sibling_element: function (el) {
    el = el.nextSibling;

    while (el && el.nodeType != 1)
      el = el.nextSibling;

    return el;
  },

  first_child_element: function (el) {
    var node;

    for (node = el.firstChild; node; node = node.nextSibling)
    {
      if (node.nodeType == 1)
        break;
    }

    return node;
  },

  first_tag: function (element, tag) {
    var node;

    if (!this.is_xhtml)
      tag = tag.toUpperCase();

    for (node = element.firstChild; node; node = node.nextSibling)
    {
      if (node.nodeType == 1 && node.nodeName == tag)
        break;
    }

    return node;
  },

  hide_selection: function () {
    if (window.getSelection) // Firefox, Chromium, Safari, Opera
    {
      var selection = window.getSelection();

      if (selection.rangeCount > 0)
      {
        var range = selection.getRangeAt(0);
        range.collapse (false);
      }
    }
    else // Internet Explorer
    {
      var textRange = document.selection.createRange ();
      textRange.collapse (false);
    }
  },

  get_selected_text: function () {
    try
    {
      if (window.getSelection)
        return window.getSelection().toString();

      if (document.getSelection)
        return document.getSelection().toString();

      if (document.selection)
        return document.selection.createRange().text;
    }
    catch (e)
    {
    }

    return "";
  },

  // make note of length of selected text
  // as this evaluates to zero in click event
  mouse_button_up: function (e) {
    w3c_slidy.selected_text_len = w3c_slidy.get_selected_text().length;
  },

  mouse_button_down: function (e) {
    w3c_slidy.selected_text_len = w3c_slidy.get_selected_text().length;
    w3c_slidy.mouse_x = e.clientX;
    w3c_slidy.mouse_y = e.clientY;
  },

  // right mouse button click is reserved for context menus
  // it is more reliable to detect rightclick than leftclick
  mouse_button_click: function (e) {
    if (!e)
      var e = window.event;

    if (Math.abs(e.clientX -w3c_slidy.mouse_x) +
        Math.abs(e.clientY -w3c_slidy.mouse_y) > 10)
      return true;

    if (w3c_slidy.selected_text_len > 0)
      return true;

    var rightclick = false;
    var leftclick = false;
    var middleclick = false;
    var target;

    if (!e)
      var e = window.event;

    if (e.target)
      target = e.target;
    else if (e.srcElement)
      target = e.srcElement;

    // work around Safari bug
    if (target.nodeType == 3)
      target = target.parentNode;

    if (e.which) // all browsers except IE
    {
      leftclick = (e.which == 1);
      middleclick = (e.which == 2);
      rightclick = (e.which == 3);
    }
    else if (e.button)
    {
      // Konqueror gives 1 for left, 4 for middle
      // IE6 gives 0 for left and not 1 as I expected

      if (e.button == 4)
        middleclick = true;

      // all browsers agree on 2 for right button
      rightclick = (e.button == 2);
    }
    else
      leftclick = true;

    if (w3c_slidy.selected_text_len > 0)
    {
      w3c_slidy.stop_propagation(e);
      e.cancel = true;
      e.returnValue = false;
      return false;
    }

    // dismiss table of contents
    w3c_slidy.hide_table_of_contents(false);

    // check if target is something that probably want's clicks
    // e.g. a, embed, object, input, textarea, select, option
    var tag = target.nodeName.toLowerCase();

    if (w3c_slidy.mouse_click_enabled && leftclick &&
        !w3c_slidy.special_element(target) &&
        !target.onclick)
    {
      w3c_slidy.next_slide(true);
      w3c_slidy.stop_propagation(e);
      e.cancel = true;
      e.returnValue = false;
      return false;
    }

    return true;
  },

  special_element: function (element) {
    if (this.has_class(element, "non-interactive"))
      return false;

    var tag = element.nodeName.toLowerCase();

    return element.onkeydown ||
      element.onclick ||
      tag == "a" ||
      tag == "embed" ||
      tag == "object" ||
      tag == "video" ||
      tag == "audio" ||
      tag == "svg" ||
      tag == "canvas" ||
      tag == "input" ||
      tag == "textarea" ||
      tag == "select" ||
      tag == "option";
  },

  slidy_chrome: function (el) {
    while (el)
    {
      if (el == w3c_slidy.toc ||
          el == w3c_slidy.toolbar ||
          w3c_slidy.has_class(el, "outline"))
        return true;

      el = el.parentNode;
    }

    return false;
  },

  get_key: function (e)
  {
    var key;

    // kludge around NS/IE differences 
    if (typeof window.event != "undefined")
      key = window.event.keyCode;
    else if (e.which)
      key = e.which;

    return key;
  },

  get_target: function (e) {
    var target;

    if (!e)
      e = window.event;

    if (e.target)
      target = e.target;
    else if (e.srcElement)
      target = e.srcElement;

    if (target.nodeType != 1)
      target = target.parentNode;

    return target;
  },

  // does display property provide correct defaults?
  is_block: function (elem) {
    var tag = elem.nodeName.toLowerCase();

    return tag == "ol" || tag == "ul" || tag == "p" || tag == "dl" ||
           tag == "li" || tag == "table" || tag == "pre" ||
           tag == "h1" || tag == "h2" || tag == "h3" ||
           tag == "h4" || tag == "h5" || tag == "h6" ||
           tag == "blockquote" || tag == "address"; 
  },

  add_listener: function (element, event, handler) {
    if (window.addEventListener)
      element.addEventListener(event, handler, false);
    else
      element.attachEvent("on"+event, handler);
  },

  // used to prevent event propagation from field controls
  stop_propagation: function (event) {
    event = event ? event : window.event;
    event.cancelBubble = true;  // for IE

    if (event.stopPropagation)
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    "restart presentation":"Recommencer l'exposé",
    "restart?":"Début"
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  help_fr:
    "Naviguez avec la souris, la barre d'espace, les flèches " +
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    "help?":"segítség",
    "contents?":"tartalom",
    "table of contents":"tartalomjegyzék",
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    "restart?":"újraindítás"
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  help_hu:
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    "help?":"Aiuto",
    "contents?":"Indice",
    "table of contents":"indice",
    "Table of Contents":"Indice",
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    "restart?":"Inizio"
  },
  help_it:
    "Navigare con mouse, barra spazio, frecce sinistra/destra o " +
    "PgUp e PgDn. Usare S e B per cambiare la dimensione dei caratteri.",

  strings_el: {
    "slide":"σελίδα",
    "help?":"βοήθεια;",
    "contents?":"περιεχόμενα;",
    "table of contents":"πίνακας περιεχομένων",
    "Table of Contents":"Πίνακας Περιεχομένων",
    "restart presentation":"επανεκκίνηση παρουσίασης",
    "restart?":"επανεκκίνηση;"
  },
  help_el:
    "Πλοηγηθείτε με το κλίκ του ποντικιού, το space, τα βέλη αριστερά/δεξιά, " +
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  strings_ja: {
    "slide":"スライド",
    "help?":"ヘルプ",
    "contents?":"目次",
    "table of contents":"目次を表示",
    "Table of Contents":"目次",
    "restart presentation":"最初から再生",
    "restart?":"最初から"
  },
  help_ja:
     "マウス左クリック ・ スペース ・ 左右キー " +
     "または Page Up ・ Page Downで操作， S ・ Bでフォントサイズ変更",

  strings_zh: {
    "slide":"幻灯片",
    "help?":"帮助?",
    "contents?":"内容?",
    "table of contents":"目录",
    "Table of Contents":"目录",
    "restart presentation":"重新启动展示",
    "restart?":"重新启动?"
  },
  help_zh:
    "用鼠标点击, 空格条, 左右箭头, Pg Up 和 Pg Dn 导航. " +
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  strings_ru: {
    "slide":"слайд",
    "help?":"помощь?",
    "contents?":"содержание?",
    "table of contents":"оглавление",
    "Table of Contents":"Оглавление",
    "restart presentation":"перезапустить презентацию",
    "restart?":"перезапуск?"
  },
  help_ru:
    "Перемещайтесь кликая мышкой, используя клавишу пробел, стрелки" +
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    "slide":"sida",
    "help?":"hjälp",
    "contents?":"innehåll",
    "table of contents":"innehållsförteckning",
    "Table of Contents":"Innehållsförteckning",
    "restart presentation":"visa presentationen från början",
    "restart?":"börja om"
  },
  help_sv:
    "Bläddra med ett klick med vänstra musknappen, mellanslagstangenten, " +
    "vänster- och högerpiltangenterna eller tangenterna Pg Up, Pg Dn. " +
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"></script>
+</head>
+<body>
+<div class="slide titlepage">
+  <h1 class="title">R#1: Introduction to R and RStudio</h1>
+  <p class="author">
+Laurent Modolo <a href="mailto:laurent.modolo@ens-lyon.fr">laurent.modolo@ens-lyon.fr</a>
+  </p>
+  <p class="date">10 Oct 2019</p>
+</div>
+<div id="r1-introduction-to-r-and-rstudio" class="slide section level2">
+<h1>R#1: Introduction to R and RStudio</h1>
+<p>The goal of this practical is to familiarize yourself with R and the RStudio environment.</p>
+<p>The objectives of this session will be to:</p>
+<ul>
+<li>Understand the purpose of each pane in RStudio</li>
+<li>Do basic computation with R</li>
+<li>Define variables and assign data to variables</li>
+<li>Manage a workspace in R</li>
+<li>Call functions</li>
+<li>Manage packages</li>
+</ul>
+<p><strong><a href="http://perso.ens-lyon.fr/laurent.modolo/R/session_1_a" class="uri">http://perso.ens-lyon.fr/laurent.modolo/R/session_1_a</a></strong></p>
+<p>Press <strong>[alt] + [shift] + k</strong></p>
+</div>
+<div id="functions-are-also-variables" class="slide section level2">
+<h1>Functions are also variables</h1>
+<p>We can also define our own function with</p>
+<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1"></a><span class="op">&lt;</span>FUNCTION_NAME<span class="op">&gt;</span><span class="st"> </span><span class="er">&lt;</span><span class="op">-</span><span class="st"> </span><span class="cf">function</span>(a, b){</span>
+<span id="cb1-2"><a href="#cb1-2"></a>  <span class="op">&lt;</span>RESULT_<span class="dv">1</span><span class="op">&gt;</span><span class="st"> </span><span class="er">&lt;</span><span class="op">-</span><span class="st"> </span><span class="er">&lt;</span>OPERATION_<span class="dv">1</span><span class="op">&gt;</span>(a, b)</span>
+<span id="cb1-3"><a href="#cb1-3"></a>  <span class="op">&lt;</span>RESULT_<span class="dv">2</span><span class="op">&gt;</span><span class="st"> </span><span class="er">&lt;</span><span class="op">-</span><span class="st"> </span><span class="er">&lt;</span>OPERATION_<span class="dv">2</span><span class="op">&gt;</span>(<span class="op">&lt;</span>RESULT_<span class="dv">1</span><span class="op">&gt;</span>, b)</span>
+<span id="cb1-4"><a href="#cb1-4"></a>  <span class="kw">return</span>(<span class="op">&lt;</span>RESULT_<span class="dv">2</span><span class="op">&gt;</span>)</span>
+<span id="cb1-5"><a href="#cb1-5"></a>}</span></code></pre></div>
+
+<p>write a function to test the base of the logarithm function</p>
+
+<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1"></a>base_test &lt;-<span class="st"> </span><span class="cf">function</span>(x, base){</span>
+<span id="cb2-2"><a href="#cb2-2"></a>  log_result &lt;-<span class="st"> </span><span class="kw">logarithm</span>(x, <span class="dt">base=</span>base)</span>
+<span id="cb2-3"><a href="#cb2-3"></a>  exp_result &lt;-<span class="st"> </span>base<span class="op">^</span>log_result</span>
+<span id="cb2-4"><a href="#cb2-4"></a>  test_result &lt;-<span class="st"> </span>x <span class="op">==</span><span class="st"> </span>exp_result</span>
+<span id="cb2-5"><a href="#cb2-5"></a>  <span class="kw">return</span>(test_result)</span>
+<span id="cb2-6"><a href="#cb2-6"></a>}</span></code></pre></div>
+<p><strong><a href="http://perso.ens-lyon.fr/laurent.modolo/R/1_b" class="uri">http://perso.ens-lyon.fr/laurent.modolo/R/1_b</a></strong></p>
+</div>
+<div id="functions-are-also-variables-1" class="slide section level2">
+<h1>Functions are also variables</h1>
+<div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1"></a>base_test &lt;-<span class="st"> </span><span class="cf">function</span>(x, base){</span>
+<span id="cb3-2"><a href="#cb3-2"></a>  <span class="kw">print</span>(x)</span>
+<span id="cb3-3"><a href="#cb3-3"></a>  log_result &lt;-<span class="st"> </span><span class="kw">logarithm</span>(x, <span class="dt">base=</span>base)</span>
+<span id="cb3-4"><a href="#cb3-4"></a>  <span class="kw">print</span>(log_result)</span>
+<span id="cb3-5"><a href="#cb3-5"></a>  exp_result &lt;-<span class="st"> </span>base<span class="op">^</span>log_result</span>
+<span id="cb3-6"><a href="#cb3-6"></a>  <span class="kw">print</span>(exp_result)</span>
+<span id="cb3-7"><a href="#cb3-7"></a>  <span class="kw">print</span>(x)</span>
+<span id="cb3-8"><a href="#cb3-8"></a>  test_result &lt;-<span class="st"> </span>x <span class="op">==</span><span class="st"> </span>exp_result</span>
+<span id="cb3-9"><a href="#cb3-9"></a>  <span class="kw">return</span>(test_result)</span>
+<span id="cb3-10"><a href="#cb3-10"></a>}</span></code></pre></div>
+<p><strong><a href="http://perso.ens-lyon.fr/laurent.modolo/R/1_c" class="uri">http://perso.ens-lyon.fr/laurent.modolo/R/1_c</a></strong></p>
+</div>
+<div id="functions-are-also-variables-2" class="slide section level2">
+<h1>Functions are also variables</h1>
+<div class="sourceCode" id="cb4"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1"></a>base_test &lt;-<span class="st"> </span><span class="cf">function</span>(x, base){</span>
+<span id="cb4-2"><a href="#cb4-2"></a>  <span class="kw">print</span>(x)</span>
+<span id="cb4-3"><a href="#cb4-3"></a>  log_result &lt;-<span class="st"> </span><span class="kw">logarithm</span>(x, <span class="dt">base=</span>base)</span>
+<span id="cb4-4"><a href="#cb4-4"></a>  <span class="kw">print</span>(log_result)</span>
+<span id="cb4-5"><a href="#cb4-5"></a>  exp_result &lt;-<span class="st"> </span>base<span class="op">^</span>log_result</span>
+<span id="cb4-6"><a href="#cb4-6"></a>  <span class="kw">print</span>(exp_result)</span>
+<span id="cb4-7"><a href="#cb4-7"></a>  <span class="kw">print</span>(x)</span>
+<span id="cb4-8"><a href="#cb4-8"></a>  test_result &lt;-<span class="st"> </span><span class="kw">isTRUE</span>(<span class="kw">all.equal</span>(x, exp_result))</span>
+<span id="cb4-9"><a href="#cb4-9"></a>  <span class="kw">return</span>(test_result)</span>
+<span id="cb4-10"><a href="#cb4-10"></a>}</span></code></pre></div>
+<p><strong><a href="http://perso.ens-lyon.fr/laurent.modolo/R/1_d" class="uri">http://perso.ens-lyon.fr/laurent.modolo/R/1_d</a></strong></p>
+</div>
+<div id="functions-are-also-variables-3" class="slide section level2">
+<h1>Functions are also variables</h1>
+<div class="sourceCode" id="cb5"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb5-1"><a href="#cb5-1"></a>base_test &lt;-<span class="st"> </span><span class="cf">function</span>(x, base){</span>
+<span id="cb5-2"><a href="#cb5-2"></a>  <span class="kw">return</span>(<span class="kw">isTRUE</span>(<span class="kw">all.equal</span>(x, base<span class="op">^</span><span class="kw">logarithm</span>(x, <span class="dt">base=</span>base))))</span>
+<span id="cb5-3"><a href="#cb5-3"></a>}</span></code></pre></div>
+<p><strong><a href="http://perso.ens-lyon.fr/laurent.modolo/R/1_e" class="uri">http://perso.ens-lyon.fr/laurent.modolo/R/1_e</a></strong></p>
+</div>
+<div id="the-environment" class="slide section level2">
+<h1>The environment</h1>
+<p></p>
+</div>
+<div id="a-code-editor" class="slide section level2">
+<h1>A code editor</h1>
+<p></p>
+</div>
+<div id="a-code-editor-1" class="slide section level2">
+<h1>A code editor</h1>
+<p>RStudio offers you great flexibility in running code from within the editor window. There are buttons, menu choices, and keyboard shortcuts. To run the current line, you can</p>
+<ul>
+<li>Click on the Run button above the editor panel, or</li>
+<li>select “Run Lines” from the “Code” menu, or</li>
+<li>hit Ctrl+Return in Windows or Linux or Cmd+Return on OS X. To run a block of code, select it and then Run.</li>
+</ul>
+<p>If you have modified a line of code within a block of code you have just run, there is no need to reselect the section and Run, you can use the next button along, Rerun the previous region. This will run the previous code block including the modifications you have made.</p>
+</div>
+<div id="a-code-editor-2" class="slide section level2">
+<h1>A code editor</h1>
+<p>Copy your <code>logarithm</code> and <code>base_test</code> into a <code>tp_1.R</code> file</p>
+
+<p>We can now clean your environment</p>
+<div class="sourceCode" id="cb6"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1"></a><span class="kw">rm</span>(x)</span></code></pre></div>
+
+<div class="sourceCode" id="cb7"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1"></a>?rm</span></code></pre></div>
+
+<div class="sourceCode" id="cb8"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1"></a><span class="kw">ls</span>()</span></code></pre></div>
+
+<div class="sourceCode" id="cb9"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb9-1"><a href="#cb9-1"></a><span class="kw">rm</span>(<span class="dt">list =</span> <span class="kw">ls</span>())</span></code></pre></div>
+</div>
+<div id="installing-packages" class="slide section level2">
+<h1>Installing packages</h1>
+<div class="sourceCode" id="cb10"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1"></a><span class="kw">install.packages</span>(<span class="st">&quot;tidyverse&quot;</span>)</span></code></pre></div>
+<div class="sourceCode" id="cb11"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb11-1"><a href="#cb11-1"></a><span class="kw">install.packages</span>(<span class="st">&quot;ggplot2&quot;</span>)</span></code></pre></div>
+</div>
+<div id="installing-packages-1" class="slide section level2">
+<h1>Installing packages</h1>
+<p></p>
+</div>
+<div id="loading-packages" class="slide section level2">
+<h1>Loading packages</h1>
+<div class="sourceCode" id="cb12"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb12-1"><a href="#cb12-1"></a><span class="kw">sessionInfo</span>()</span></code></pre></div>
+
+<div class="sourceCode" id="cb13"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb13-1"><a href="#cb13-1"></a><span class="kw">library</span>(tidyverse)</span></code></pre></div>
+
+<div class="sourceCode" id="cb14"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb14-1"><a href="#cb14-1"></a><span class="kw">sessionInfo</span>()</span></code></pre></div>
+
+<div class="sourceCode" id="cb15"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb15-1"><a href="#cb15-1"></a><span class="kw">unloadNamespace</span>(<span class="st">&quot;tidyverse&quot;</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb16"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb16-1"><a href="#cb16-1"></a><span class="kw">sessionInfo</span>()</span></code></pre></div>
+</div>
+<div id="complex-variable-type" class="slide section level2">
+<h1>Complex variable type</h1>
+</div>
+<div id="vector-aka-list" class="slide section level2">
+<h1>Vector (aka list)</h1>
+<div class="sourceCode" id="cb17"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb17-1"><a href="#cb17-1"></a><span class="kw">c</span>(<span class="dv">1</span>, <span class="dv">2</span>, <span class="dv">3</span>, <span class="dv">4</span>, <span class="dv">5</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb18"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb18-1"><a href="#cb18-1"></a><span class="dv">1</span><span class="op">:</span><span class="dv">5</span></span></code></pre></div>
+
+<div class="sourceCode" id="cb19"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb19-1"><a href="#cb19-1"></a><span class="dv">2</span><span class="op">^</span>(<span class="dv">1</span><span class="op">:</span><span class="dv">5</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb20"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb20-1"><a href="#cb20-1"></a>x &lt;-<span class="st"> </span><span class="dv">1</span><span class="op">:</span><span class="dv">5</span></span>
+<span id="cb20-2"><a href="#cb20-2"></a><span class="dv">2</span><span class="op">^</span>x</span></code></pre></div>
+
+<div class="sourceCode" id="cb21"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb21-1"><a href="#cb21-1"></a><span class="kw">log</span>(x)</span>
+<span id="cb21-2"><a href="#cb21-2"></a><span class="kw">logarithm</span>(x)</span>
+<span id="cb21-3"><a href="#cb21-3"></a><span class="kw">base_test</span>(x, <span class="dt">base =</span> <span class="dv">10</span>)</span></code></pre></div>
+</div>
+<div id="vector-aka-list-1" class="slide section level2">
+<h1>Vector (aka list)</h1>
+<div class="sourceCode" id="cb22"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb22-1"><a href="#cb22-1"></a><span class="kw">typeof</span>(x)</span></code></pre></div>
+
+<div class="sourceCode" id="cb23"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb23-1"><a href="#cb23-1"></a><span class="kw">typeof</span>(x <span class="op">+</span><span class="st"> </span><span class="fl">0.5</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb24"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb24-1"><a href="#cb24-1"></a><span class="kw">is.vector</span>(x)</span></code></pre></div>
+
+<div class="sourceCode" id="cb25"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb25-1"><a href="#cb25-1"></a><span class="kw">length</span>(x)</span></code></pre></div>
+
+<div class="sourceCode" id="cb26"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb26-1"><a href="#cb26-1"></a>x[<span class="dv">5</span>]</span></code></pre></div>
+
+<div class="sourceCode" id="cb27"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb27-1"><a href="#cb27-1"></a>y &lt;-<span class="st"> </span><span class="kw">c</span>(<span class="dt">a =</span> <span class="dv">1</span>, <span class="dt">b =</span> <span class="dv">2</span>, <span class="dt">c =</span> <span class="dv">3</span>, <span class="dt">d =</span> <span class="dv">4</span>, <span class="dt">e =</span> <span class="dv">5</span>)</span>
+<span id="cb27-2"><a href="#cb27-2"></a><span class="kw">typeof</span>(y)</span>
+<span id="cb27-3"><a href="#cb27-3"></a><span class="kw">is.vector</span>(y)</span>
+<span id="cb27-4"><a href="#cb27-4"></a><span class="kw">names</span>(y)</span>
+<span id="cb27-5"><a href="#cb27-5"></a>y[<span class="dv">1</span>]</span>
+<span id="cb27-6"><a href="#cb27-6"></a>y[<span class="st">&quot;a&quot;</span>]</span>
+<span id="cb27-7"><a href="#cb27-7"></a><span class="kw">names</span>(y) &lt;-<span class="st"> </span><span class="kw">c</span>(<span class="st">&quot;b&quot;</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb28"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb28-1"><a href="#cb28-1"></a>x <span class="op">==</span><span class="st"> </span>y</span>
+<span id="cb28-2"><a href="#cb28-2"></a><span class="kw">all.equal</span>(x, y)</span></code></pre></div>
+</div>
+<div id="vector-challenge" class="slide section level2">
+<h1>Vector challenge</h1>
+<ul>
+<li>use the <code>seq()</code> function to create a vector of even numbers</li>
+<li>You can concatenate vector with <code>c(&lt;VECTOR_1&gt;, &lt;VECTOR_2&gt;)</code>, concatenate a vector of integers with a vector of the first 5 letters of the alphabet.</li>
+<li>Check the default vectors <code>letters</code> and <code>LETTERS</code>, rewrite your previous command using them.</li>
+<li>Create a vector giving you the correspondence between small case letters and upper case letters.</li>
+</ul>
+</div>
+<div id="vector-challenge-1" class="slide section level2">
+<h1>Vector challenge</h1>
+<ul>
+<li>use the <code>seq()</code> function to create a vector of even numbers</li>
+</ul>
+<div class="sourceCode" id="cb29"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb29-1"><a href="#cb29-1"></a><span class="kw">seq</span>(<span class="dt">from=</span><span class="dv">2</span>, <span class="dt">to=</span><span class="dv">10</span>, <span class="dt">by=</span><span class="dv">2</span>)</span></code></pre></div>
+<ul>
+<li>You can concatenate vector with <code>c(&lt;VECTOR_1&gt;, &lt;VECTOR_2&gt;)</code>, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.</li>
+<li>Check the default vectors <code>letters</code> and <code>LETTERS</code>, rewrite your previous command using them.</li>
+<li>Create a vector giving you the correspondence between small case letters and upper case letters.</li>
+</ul>
+</div>
+<div id="vector-challenge-2" class="slide section level2">
+<h1>Vector challenge</h1>
+<ul>
+<li>use the <code>seq()</code> function to create a vector of even numbers</li>
+</ul>
+<div class="sourceCode" id="cb30"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb30-1"><a href="#cb30-1"></a><span class="kw">seq</span>(<span class="dt">from=</span><span class="dv">2</span>, <span class="dt">to=</span><span class="dv">10</span>, <span class="dt">by=</span><span class="dv">2</span>)</span></code></pre></div>
+<ul>
+<li>You can concatenate vector with <code>c(&lt;VECTOR_1&gt;, &lt;VECTOR_2&gt;)</code>, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.</li>
+<li>Check the default vectors <code>letters</code> and <code>LETTERS</code>, rewrite your previous command using them.</li>
+<li>Create a vector giving you the correspondence between small case letters and upper case letters.</li>
+</ul>
+</div>
+<div id="vector-challenge-3" class="slide section level2">
+<h1>Vector challenge</h1>
+<ul>
+<li>use the <code>seq()</code> function to create a vector of even numbers</li>
+<li>You can concatenate vector with <code>c(&lt;VECTOR_1&gt;, &lt;VECTOR_2&gt;)</code>, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.</li>
+</ul>
+<div class="sourceCode" id="cb31"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb31-1"><a href="#cb31-1"></a><span class="kw">c</span>(<span class="dv">1</span><span class="op">:</span><span class="dv">5</span>, <span class="st">&quot;a&quot;</span>, <span class="st">&quot;b&quot;</span>, <span class="st">&quot;c&quot;</span>)</span>
+<span id="cb31-2"><a href="#cb31-2"></a><span class="kw">typeof</span>(<span class="kw">c</span>(<span class="dv">1</span><span class="op">:</span><span class="dv">5</span>, <span class="st">&quot;a&quot;</span>, <span class="st">&quot;b&quot;</span>, <span class="st">&quot;c&quot;</span>))</span></code></pre></div>
+<ul>
+<li>Check the default vectors <code>letters</code> and <code>LETTERS</code>, rewrite your previous command using them.</li>
+<li>Create a vector giving you the correspondence between small case letters and upper case letters.</li>
+</ul>
+</div>
+<div id="vector-challenge-4" class="slide section level2">
+<h1>Vector challenge</h1>
+<ul>
+<li>use the <code>seq()</code> function to create a vector of even numbers</li>
+<li>You can concatenate vector with <code>c(&lt;VECTOR_1&gt;, &lt;VECTOR_2&gt;)</code>, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.</li>
+<li>Check the default vectors <code>letters</code> and <code>LETTERS</code>, rewrite your previous command using them.</li>
+</ul>
+<div class="sourceCode" id="cb32"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb32-1"><a href="#cb32-1"></a><span class="kw">c</span>(<span class="dv">1</span><span class="op">:</span><span class="dv">5</span>, letters[<span class="dv">1</span><span class="op">:</span><span class="dv">3</span>])</span></code></pre></div>
+<ul>
+<li>Create a vector giving you the correspondence between small case letters and upper case letters.</li>
+</ul>
+</div>
+<div id="vector-challenge-5" class="slide section level2">
+<h1>Vector challenge</h1>
+<ul>
+<li>use the <code>seq()</code> function to create a vector of even numbers</li>
+<li>You can concatenate vector with <code>c(&lt;VECTOR_1&gt;, &lt;VECTOR_2&gt;)</code>, concatenate a vector of integers with a vector of the first 5 letters of the alphabet. What is the type of this vector.</li>
+<li>Check the default vectors <code>letters</code> and <code>LETTERS</code>, rewrite your previous command using them.</li>
+<li>Create a vector giving you the correspondence between small case letters and upper case letters.</li>
+</ul>
+<div class="sourceCode" id="cb33"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb33-1"><a href="#cb33-1"></a>rosette &lt;-<span class="st"> </span>LETTERS</span>
+<span id="cb33-2"><a href="#cb33-2"></a><span class="kw">names</span>(rosette) &lt;-<span class="st"> </span>letters</span>
+<span id="cb33-3"><a href="#cb33-3"></a>rosette[<span class="st">&quot;b&quot;</span>]</span>
+<span id="cb33-4"><a href="#cb33-4"></a>rosette[<span class="dv">13</span>]</span></code></pre></div>
+</div>
+<div id="matrix" class="slide section level2">
+<h1>Matrix</h1>
+<p>In R matrix are two dimensional vectors</p>
+<div class="sourceCode" id="cb34"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb34-1"><a href="#cb34-1"></a>matrix_example &lt;-<span class="st"> </span><span class="kw">matrix</span>(<span class="dv">1</span><span class="op">:</span>(<span class="dv">6</span><span class="op">*</span><span class="dv">3</span>), <span class="dt">ncol=</span><span class="dv">6</span>, <span class="dt">nrow=</span><span class="dv">3</span>)</span>
+<span id="cb34-2"><a href="#cb34-2"></a>matrix_example</span></code></pre></div>
+
+<div class="sourceCode" id="cb35"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb35-1"><a href="#cb35-1"></a><span class="kw">class</span>(matrix_example)</span>
+<span id="cb35-2"><a href="#cb35-2"></a><span class="kw">nrow</span>(matrix_example)</span>
+<span id="cb35-3"><a href="#cb35-3"></a><span class="kw">ncol</span>(matrix_example)</span></code></pre></div>
+
+<div class="sourceCode" id="cb36"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb36-1"><a href="#cb36-1"></a>matrix_example[<span class="dv">2</span>, <span class="dv">3</span>]</span></code></pre></div>
+</div>
+<div id="dataframe" class="slide section level2">
+<h1>DataFrame</h1>
+<p>In R <code>data.frame</code> are table type with mixed type</p>
+<div class="sourceCode" id="cb37"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb37-1"><a href="#cb37-1"></a>data_frame_example &lt;-<span class="st"> </span><span class="kw">data.frame</span>(<span class="dt">numbers=</span><span class="dv">1</span><span class="op">:</span><span class="dv">26</span>, <span class="dt">letters=</span>letters, <span class="dt">LETTERS=</span>LETTERS)</span>
+<span id="cb37-2"><a href="#cb37-2"></a>data_frame_example</span></code></pre></div>
+
+<div class="sourceCode" id="cb38"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb38-1"><a href="#cb38-1"></a><span class="kw">class</span>(data_frame_example)</span>
+<span id="cb38-2"><a href="#cb38-2"></a><span class="kw">nrow</span>(data_frame_example)</span>
+<span id="cb38-3"><a href="#cb38-3"></a><span class="kw">ncol</span>(data_frame_example)</span>
+<span id="cb38-4"><a href="#cb38-4"></a><span class="kw">names</span>(data_frame_example)</span></code></pre></div>
+
+<div class="sourceCode" id="cb39"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb39-1"><a href="#cb39-1"></a>data_frame_example[<span class="dv">2</span>, <span class="dv">3</span>]</span>
+<span id="cb39-2"><a href="#cb39-2"></a>data_frame_example[<span class="st">&quot;numbers&quot;</span>]</span></code></pre></div>
+</div>
+<div id="list" class="slide section level2">
+<h1>List</h1>
+<p>In R <code>list</code> are multitypes object</p>
+<div class="sourceCode" id="cb40"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb40-1"><a href="#cb40-1"></a><span class="kw">list</span>(<span class="dt">a =</span> <span class="st">&quot;test&quot;</span>, <span class="dt">b =</span> <span class="dv">1</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb41"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb41-1"><a href="#cb41-1"></a><span class="kw">list</span>(<span class="dt">a =</span> <span class="st">&quot;test&quot;</span>, <span class="dt">b =</span> <span class="dv">1</span><span class="op">:</span><span class="dv">5</span>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb42"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb42-1"><a href="#cb42-1"></a>z &lt;-<span class="st"> </span><span class="kw">list</span>(</span>
+<span id="cb42-2"><a href="#cb42-2"></a>  <span class="dt">a =</span> <span class="st">&quot;test&quot;</span>,</span>
+<span id="cb42-3"><a href="#cb42-3"></a>  <span class="dt">b =</span> <span class="dv">1</span><span class="op">:</span><span class="dv">5</span>,</span>
+<span id="cb42-4"><a href="#cb42-4"></a>  <span class="dt">c =</span> <span class="kw">data.frame</span>(<span class="dt">numbers=</span><span class="dv">1</span><span class="op">:</span><span class="dv">26</span>, <span class="dt">letters=</span>letters, <span class="dt">LETTERS=</span>LETTERS)</span>
+<span id="cb42-5"><a href="#cb42-5"></a>)</span></code></pre></div>
+
+<div class="sourceCode" id="cb43"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb43-1"><a href="#cb43-1"></a><span class="kw">list</span>(</span>
+<span id="cb43-2"><a href="#cb43-2"></a>  <span class="dt">a =</span> <span class="st">&quot;test&quot;</span>,</span>
+<span id="cb43-3"><a href="#cb43-3"></a>  <span class="dt">b =</span> <span class="dv">1</span><span class="op">:</span><span class="dv">5</span>,</span>
+<span id="cb43-4"><a href="#cb43-4"></a>  <span class="dt">c =</span> z</span>
+<span id="cb43-5"><a href="#cb43-5"></a>)</span></code></pre></div>
+</div>
+
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