#8422: ChainPoset in broken for small input
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Reporter: hivert | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.3.4
Component: combinatorics | Keywords: ChainPoset
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by newvalueoldvalue):
* status: new => needs_review
* author: => Florent Hivert
Old description:
> For n>2 the answer is correct:
> {{{
> sage: Posets.ChainPoset(3).size()
> 3
> sage: Posets.ChainPoset(4).size()
> 4
> sage: Posets.ChainPoset(5).size()
> 5
> }}}
> However:
> {{{
> sage: Posets.ChainPoset(2).size()
> 1
> sage: Posets.ChainPoset(1).size()
> ...
> ValueError: not valid poset data.
> }}}
New description:
For n>2 the answer is correct:
{{{
sage: Posets.ChainPoset(3).size()
3
sage: Posets.ChainPoset(4).size()
4
sage: Posets.ChainPoset(5).size()
5
}}}
However:
{{{
sage: Posets.ChainPoset(2).size()
1
sage: Posets.ChainPoset(1).size()
...
ValueError: not valid poset data.
}}}
{{{AntichainPosets}}} show the same wrong behavior.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8422#comment:1>
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