In Sage, the "degree" of a vertex in a directed graph is the degree of the same vertex in the undirected version of the graph. It is the number of edges "touching" this vertex. If you just want the out- degree (number of edges leaving the vertex), then it is out_degree (resp in-degree, in_degree).
When a graph is undirected, sage remembers the edges in both directions, so returning the out_degree is fine :-) A circuit has an in_degree equal to its out_degree equal to 1. The degree is 2, though :-) 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
