There is now a patch available for the original suggestion that graph eigenvalues could be improved. In the course of doing this, I discovered that any eigenvalue of a graph was having its complex part stripped off. Presumably, this was to clean up annoying nearly-zero complex parts for graphs (which have real eigenvalues), but is clearly the wrong thing to do for general digraphs. So the patch corrects this substantial bug (i.e. I hope the patch doesn't languish!).
http://trac.sagemath.org/sage_trac/ticket/6258 An object like the Factorization object would be a good thing to hold the spectrum of a graph, but other than a couple hours pondering its design, I've done nothing on that front. Rob --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
