#11739: add_vertex w/o params should return the new vertex
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Reporter: ddestrada | Owner: jason, ncohen, rlm
Type: enhancement | Status: new
Priority: minor | Milestone: sage-4.7.2
Component: graph theory | Keywords: add_vertex
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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It's nice to have a way to add a new vertex no matter what the graph is.
That is the purpose of executing add_vertex() without parameters: to add a
vertex numbered with the least nonnegative integer not already in the
graph.
But the problem is that it doesn't return the number, so you can't add
edges to it. Therefore add_vertex() w/o params currently is only useful
for adding isolated vertices.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11739>
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