#9925: Doctest error in sage/graphs/graph.py
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Reporter: mpatel | Owner: mvngu
Type: defect | Status: closed
Priority: blocker | Milestone: sage-4.6
Component: doctest | Resolution: worksforme
Keywords: | Author:
Upstream: N/A | Reviewer:
Merged: | Work_issues:
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Comment(by ncohen):
Hmmm.... It looks like it's not --so-- rare O_o
{{{
sage: sum( not isinstance(graphs.RandomBipartite(10, 10,
.5).is_even_hole_free(certificate = True), Graph) for i in range(10000) )
96
}}}
something like 1%...`:-/`
And with this :
{{{
sage: t = lambda x: Graph(x).is_forest() or
isinstance(x.is_even_hole_free(certificate = True), Graph)
sage: sum( not t(graphs.RandomBipartite(10, 10, .5)) for i in range(10000)
)
111
}}}
Which means it comes from .... the bug in the method subgraph_search, and
not from the theoretical probability `:-/`
With the patch applied :
{{{
sage: sage: t = lambda x: Graph(x).is_forest() or
isinstance(x.is_even_hole_free(certificate = True), Graph)
sage: sage: sum( not t(graphs.RandomBipartite(10, 10, .5)) for i in
range(10000) )
0
}}}
Which **relieved** me. I should post a patch to add this is_forest
condition anyway. Can I put it on this ticket ?
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9925#comment:6>
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