Well, in my use of directed graphs I can swear I need to talk about out-neighbors at least as often as I need to talk about out- neighbors.... Storing them two time would not be a waste in opinion, and anyway we can not afford to have only the out-neighbors available... I have not read the implementation of c_graphs yet ( and I intend to ) but this should not be too hard to go back if we are not satisfied with the speed ( which I hope will not happen ) :-)
Nathann -- 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
