#15810: Immutable directed graphs should know that they are directed
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Reporter: SimonKing | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: graph theory | Resolution:
Keywords: immutable directed graph | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by SimonKing):
Variation of the theme:
{{{
sage: Q = DiGraph({1:{2:['a','b'], 3:['c']}, 2:{3:['d']}}, immutable=True)
sage: Q.is_directed_acyclic()
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-3-a8ff599a3235> in <module>()
----> 1 Q.is_directed_acyclic()
/home/king/Sage/git/sage/local/lib/python2.7/site-
packages/sage/graphs/digraph.pyc in is_directed_acyclic(self, certificate)
1108 False
1109 """
-> 1110 return self._backend.is_directed_acyclic(certificate =
certificate)
1111
1112 def to_directed(self):
/home/king/Sage/git/sage/local/lib/python2.7/site-
packages/sage/graphs/base/c_graph.so in
sage.graphs.base.c_graph.CGraphBackend.is_directed_acyclic
(sage/graphs/base/c_graph.c:19328)()
/home/king/Sage/git/sage/local/lib/python2.7/site-
packages/sage/graphs/base/c_graph.so in
sage.graphs.base.c_graph.bitset_init (sage/graphs/base/c_graph.c:3113)()
ValueError: bitset capacity must be greater than 0
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15810#comment:1>
Sage <http://www.sagemath.org>
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