From f226fd1d79506a9af2c98b4b5522a5c3fa404a78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Radek=20Hu=C5=A1ek?= <husek@iuuk.mff.cuni.cz>
Date: Thu, 29 Jul 2021 21:40:17 +0200
Subject: [PATCH] fix matrix_formula_period()

---
 graph_tools/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/graph_tools/utils.py b/graph_tools/utils.py
index cb03498..4c7efe2 100644
--- a/graph_tools/utils.py
+++ b/graph_tools/utils.py
@@ -201,7 +201,7 @@ def _init_():
       for i in range(len(seen)):
         if seen[i] == r:
           return (i + shift,
-            [None]*shift + (seen if vectors else [min(1, (l*v)[0, 0]) for v in seen ]))
+            [None]*shift + (seen if vectors else [ int(l*v != 0) for v in seen ]))
 
       seen.append(r)
       r = to_zero_one(A*r)
-- 
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