#15810: Immutable directed graphs should know that they are directed
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Reporter: SimonKing | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: graph theory | Resolution:
Keywords: immutable | Merged in:
directed graph | Reviewers:
Authors: Simon King | Work issues:
Report Upstream: N/A | Commit:
Branch: | 1382f4f40bea6fbf32af4f0f745aa2f645a235af
u/SimonKing/ticket/15810 | Stopgaps:
Dependencies: #15623 |
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Comment (by SimonKing):
Replying to [comment:15 ncohen]:
> No problem with SparseGraph backends ? Then I don't get it either.
Apparently:
{{{
sage: D = DiGraph({1:{2:['a','b'], 3:['c']}, 2:{3:['d']}})
sage: D.is_directed_acyclic()
True
sage: I = D.copy(immutable=True)
sage: I.is_directed_acyclic()
True
sage: D._backend
<class 'sage.graphs.base.sparse_graph.SparseGraphBackend'>
sage: I._backend
<class 'sage.graphs.base.static_sparse_backend.StaticSparseBackend'>
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15810#comment:16>
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