#12155: Bug when taking complement of bipartite graph.
----------------------------+-----------------------------------------------
Reporter: fidelbarrera | Owner: jason, ncohen, rlm
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: graph theory | Keywords: bipartite, complement
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
----------------------------+-----------------------------------------------
Changes (by ncohen):
* cc: jason (added)
* status: new => needs_review
Old description:
> Quick description:
>
> {{{
> sage: g=graphs.CompleteBipartiteGraph(3,3)
> sage: g.complement()
> ...
> RuntimeError: Edge vertices must lie in different partitions.
> }}}
>
> For more details please see discussion at
>
> http://groups.google.com/group/sage-
> devel/browse_thread/thread/9fc4c6bfa8d005b3
New description:
Quick description:
{{{
sage: g=graphs.CompleteBipartiteGraph(3,3)
sage: g.complement()
...
RuntimeError: Edge vertices must lie in different partitions.
}}}
For more details please see discussion at
http://groups.google.com/group/sage-
devel/browse_thread/thread/9fc4c6bfa8d005b3
Apply:
* [attachment:trac_12155.patch]
--
Comment:
Fixing the problem by ensuring that no instances of BipartiteGraph are
returned by the graph generators.
https://groups.google.com/d/topic/sage-devel/n8TGv6jQBbM/discussion
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12155#comment:3>
Sage <http://www.sagemath.org>
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