Dear all, I encountered some undesirable behavior when trying to contract an edge in a bipartite graph:
sage: G = graphs.CompleteBipartiteGraph(3,3) sage: G.merge_vertices([1,4]) Yields: RuntimeError: Edge vertices must lie in different partitions. sage: G.num_verts() 5 I'm ok with not being able to contract in a bipartite graph. I'm ok with being presented with an error. I'm NOT ok with my original graph suddenly being rubbish! (The net effect of merge_vertices is to delete vertex 4 in this case, which makes no sense). Cheers, Stefan. -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
