#9809: Graph.num_edges() gives wrong answer
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Reporter: tobiasljohnson | Owner: someone
Type: defect | Status: new
Priority: major | Milestone: sage-4.5.3
Component: graph theory | Keywords: num_edges,multiedges
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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If G is a graph with multiedges that contains two copies of an edge e, and
you delete one of the copies, num_edges() doesn't go down by one. For
example,
{{{
sage: G = Graph(multiedges = True)
sage: G.add_edges([(0,1), (0,1)])
sage: G.delete_edge(0,1)
sage: G.num_edges()
2
sage: G.edges()
[(0, 1, None)]
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9809>
Sage <http://www.sagemath.org>
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