From 2f55bd72fb892f815e0cf9c04accefa76a42d471 Mon Sep 17 00:00:00 2001
From: Mia Croiset <mia.croiset@ens-lyon.fr>
Date: Mon, 22 Jan 2024 14:17:43 +0100
Subject: [PATCH] correct

---
 bin/hicstuff_build_matrix.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bin/hicstuff_build_matrix.py b/bin/hicstuff_build_matrix.py
index 194a9d3..cf3fea2 100755
--- a/bin/hicstuff_build_matrix.py
+++ b/bin/hicstuff_build_matrix.py
@@ -72,7 +72,8 @@ def pairs2matrix(
     # )
 
     cmd = 'grep -v ^# %s | sort -S 2G -k8,8n -k9,9n --parallel=1' % pairs_file
-    os.system(cmd '>>' prem_mat_file)
+    with open(pre_mat_file, "a") as fout:
+        fout.write(os.system(cmd))
 
     header_size = len(hio.get_pairs_header(pre_mat_file))
     with open(pre_mat_file, "r") as pairs, open(mat_file, "w") as mat:
-- 
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