#17138: LatticePoset: complements() is broken
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Reporter: jmantysalo | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jmantysalo:
Old description:
> Complement of an element of lattice, if it exists, is not necessarily
> unique. Hence returning an array from `complements()` seems to be totally
> wrong. Right way is to return a dict of lists if called without arguments
> and a list if called with one element as argument.
New description:
Complement of an element of lattice, if it exists, is not necessarily
unique. Hence returning an array from `complements()` seems to be totally
wrong. Right way is to return a dict of lists if called without arguments
and a list if called with one element as argument.
To clarify what is wrong in all possible meanings for a function called
"complements":
{{{
sage: Posets.PentagonPoset().complements()
[4, 3, 1, 1, 0]
sage: LatticePoset({'a':'b'}).complements()
[1, 0]
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17138#comment:1>
Sage <http://www.sagemath.org>
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