#17548: Partitions() is buggy
---------------------------------+---------------------------
Reporter: ferriszorro | Owner: ferriszorro
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: combinatorics | Resolution:
Keywords: Partitions | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps: #17637
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Changes (by jdemeyer):
* priority: minor => major
Old description:
> The following bug was reported by an humanoid:
>
> {{{
> sage: Partitions(5, min_slope=1).list()
> ValueError: [2, 4] is not a valid partition
> }}}
>
> Even worse (since silent):
>
> {{{
> sage: Partitions(5, min_slope=2).list()
> [[5]]
> }}}
New description:
There are various bugs in `Partitions`/`Compositions`, especially when
many constraints are combined:
{{{
sage: Partitions(5, min_slope=1).list()
ValueError: [2, 4] is not a valid partition
}}}
{{{
sage: Partitions(6, outer=[4,2], inner=[3,3]).list()
[[3, 3]]
}}}
{{{
sage: Compositions(4, length=3, min_slope=1).list()
[[1, 2, 4]]
}}}
{{{
sage: Compositions(6, max_part=3, max_slope=-1).list()
[[3, 3], [3, 2, 1]]
}}}
--
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Ticket URL: <http://trac.sagemath.org/ticket/17548#comment:33>
Sage <http://www.sagemath.org>
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