#12587: simplicial complexes lack hash function
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Reporter: vpilaud | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.5
Component: combinatorics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Christian Stump
Authors: Travis Scrimshaw | Merged in:
Dependencies: | Stopgaps:
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Changes (by jhpalmieri):
* status: needs_work => needs_review
Old description:
> Simplicial complexes are lacking a proper hash function. See the example
> below.
>
> {{{
> sage: S = SimplicialComplex([[]]); S
> Simplicial complex with vertex set () and facets {()}
> sage: hash(S)
> -3899221226149827755
> sage: S.__hash__??
> Source:
> def __hash__(self):
> return hash(self.__repr__())
> }}}
New description:
Simplicial complexes are lacking a proper hash function. See the example
below.
{{{
sage: S = SimplicialComplex([[]]); S
Simplicial complex with vertex set () and facets {()}
sage: hash(S)
-3899221226149827755
sage: S.__hash__??
Source:
def __hash__(self):
return hash(self.__repr__())
}}}
-------
Apply:
- [attachment:trac_12587-simplicial_complex_hash-ts.patch]
- [attachment:trac_12587-simplicial_complex_hash_review-cs.patch]
- [attachment:trac_12587-ref-jhp.patch]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12587#comment:41>
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