#20253: bug in strongly connected test for static digraphs
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Reporter: vdelecroix | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: graph theory | Keywords: bug
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Using the strongly connected graph from [https://graph-
tool.skewed.de/performance this page] I got
{{{
sage: import networkx
sage: g = networkx.read_graphml("pgp.xml")
sage: networkx.is_strongly_connected(g)
True
sage: G = DiGraph(g)
sage: G.is_strongly_connected()
True
}}}
But the test goes wrong with the static sparse backend
{{{
sage: G2 = DiGraph(g, immutable=True)
sage: G2.is_strongly_connected()
False
sage: G == G2
True
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20253>
Sage <http://www.sagemath.org>
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