Hello, I apologise I can't give a better bug report than this, but I've been playing with generating geometric graphs using graph-tool. I think the periodic boundary conditions may not be working properly in some cases, literally I think corner cases, or maybe there's a rounding error of some kind? I was trying to create a hexagonal close packed-like geometric graph. (I'm fairly new to graph analysis, and I've been struggling to come up with a good example that would show this bug because I'm finding it difficult to track down exactly which edges are missing, but I'm pretty sure something's wrong because I'm not getting the number of edges I expect.) I'd be grateful for any help or direction. Thanks, Matthew -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.