#13566: Simplicial complex examples as singletons
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Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-5.5
Component: algebraic topology | Resolution:
Keywords: simplicial | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: #13244, #12587 | Stopgaps:
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Description changed by jhpalmieri:
Old description:
> Since each of the examples are unique, there should only be one
> (immutable) instance of each. In other words, we do not recreate the
> example each time it is called. For example
> {{{
> sage: S1 = simplicial_complexes.KleinBottle()
> sage: S2 = simplicial_complexes.KleinBottle()
> sage: S1 == S2
> True
> sage: S1 is S2
> False
> }}}
> where the last should return `true`. Possibly do this by something like
> {{{
> def KlienBottle(self):
> if not hasattr(self, "_klien_bottle_output"):
> self._klien_bottle_output = SimplicialComplex(facets)
> return self._klien_bottle_output
> }}}
> This is an expansion on the concept in #13244 and the dependency on
> #12587 is in making simplicial complexes immutable.
New description:
Since each of the examples are unique, there should only be one
(immutable) instance of each. In other words, we do not recreate the
example each time it is called. For example
{{{
sage: S1 = simplicial_complexes.KleinBottle()
sage: S2 = simplicial_complexes.KleinBottle()
sage: S1 == S2
True
sage: S1 is S2
False
}}}
where the last should return `true`. Possibly do this by something like
{{{
def KlienBottle(self):
if not hasattr(self, "_klien_bottle_output"):
self._klien_bottle_output = SimplicialComplex(facets)
return self._klien_bottle_output
}}}
This is an expansion on the concept in #13244 and the dependency on #12587
is in making simplicial complexes immutable.
----------
Apply [attachment:trac_13566cna.patch].
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13566#comment:10>
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