raise RuntimeError from "canon_graph() if colored

pdobsan · Sep 24, 2023 · 010ef80 · 010ef80
1 parent 2750842
commit 010ef80
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/pynauty/graph.py b/src/pynauty/graph.py
@@ -223,6 +223,8 @@ def canon_graph(g):
     return ->
         new canonical graph.
     '''
+    if g.vertex_coloring:
+        raise RuntimeError("canon_graph() is not implemented for vertex-colored graphs yet.")
     c = certificate(g)
     set_length = len(c) // g.number_of_vertices
     sets = [c[set_length*k:set_length*(k+1)] for k in range(g.number_of_vertices)]