prop: use mutable bool adj mat in IsHamiltonianDigraph (#192)

digraphs · Apr 10, 2019 · eb1904c · eb1904c
1 parent 12efe9a
commit eb1904c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/gap/prop.gi b/gap/prop.gi
@@ -574,7 +574,7 @@ function(gr)
     indegs := InDegrees(gr);
     outdegs := OutDegrees(gr);
     fulldegs := indegs + outdegs;
-    adjmatrix := BooleanAdjacencyMatrix(gr);
+    adjmatrix := BooleanAdjacencyMatrixMutableCopy(gr);
     # checks if Meyniel's theorem, Theorem 4.1 or Theorem 4.2 are applicable.
     checkMT := true;
     check41 := true;