#9807: merge_vertices behavior in a graph with loops
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Reporter: tobiasljohnson | Owner: jason, ncohen, rlm
Type: defect | Status: new
Priority: minor | Milestone: sage-4.5.3
Component: graph theory | Keywords: merge_vertices, loops
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Suppose G is a graph with loops permitted containing the edge (0, 1). I
would expect that G.merge_vertices([0, 1]) would create a loop (0, 0), but
it doesn't:
{{{
sage: G = Graph(loops = True)
sage: G.add_edge(0, 1)
sage: G.merge_vertices([0, 1])
sage: G.edges()
[]
}}}
I think either we should change this, or we should write explicitly in the
documentation that merge_vertices doesn't create self-loops even when G
allows them.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9807>
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