digraph.diameter() returning +Infinity for some cases
I'm running Sage 6.4.1 on OS X (Yosemite). Creating a directed graph with
n vertices (for any n that I tried) returned
sage: digraphs.Path(10).diameter() +Infinity
sage: digraphs.ButterflyGraph(5).diameter() +Infinity
However, both of these Path and Butterfly graphs are finite, connected, directed acyclic graphs so their diameter should always be finite.