#9073: Handle multigraphs better in planarity
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Reporter: boothby | Owner: jason, ncohen, rlm
Type: defect | Status: needs_work
Priority: minor | Milestone: sage-4.4.4
Component: graph theory | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by boothby):
* status: positive_review => needs_work
Comment:
oops, jumped the gun. we need to check for loops, too.
{{{
sage: G = Graph(loops=True)
sage: G.add_edge(0,0)
sage: G.add_edge(1,0)
sage: G.is_planar(set_embedding=True)
sage: G.get_embedding()
Traceback (click to the left of this block for traceback)
...
Exception: Looped graph on 2 vertices has been modified and the
embedding is no longer valid.
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9073#comment:5>
Sage <http://www.sagemath.org>
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