#12848: Bug in order_ideal_complement_generators: 'down'
--------------------------------------------------------+-------------------
Reporter: nthiery | Owner:
sage-combinat
Type: defect | Status:
needs_review
Priority: major | Milestone:
sage-5.11
Component: combinatorics | Resolution:
Keywords: posets | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nicolas M. Thiéry, Frédéric Chapoton | Merged in:
Dependencies: | Stopgaps:
--------------------------------------------------------+-------------------
Changes (by aschilling):
* status: needs_work => needs_review
Old description:
> The down option is broken in order_ideal_complement_generators due to
> a glitch:
> {{{
> sage: P = Poset( ( [1,2,3], [ [1,3], [2,3] ] ) )
> sage: sage: P.order_ideal_complement_generators([1,2],
> direction='up')
> set([3])
> sage: P.order_ideal_complement_generators([1,2], direction='down')
> set([3])
> }}}
>
> The result should be [] in the later case.
>
> Upcoming patch on the Sage-Combinat queue
>
> Apply [attachment:trac_12848-posets-
> order_ideal_complement_generators_fix-nt-v2.patch]
New description:
The down option is broken in order_ideal_complement_generators due to
a glitch:
{{{
sage: P = Poset( ( [1,2,3], [ [1,3], [2,3] ] ) )
sage: sage: P.order_ideal_complement_generators([1,2], direction='up')
set([3])
sage: P.order_ideal_complement_generators([1,2], direction='down')
set([3])
}}}
The result should be [] in the later case.
Upcoming patch on the Sage-Combinat queue
Apply:
[attachment:trac_12848-posets-order_ideal_complement_generators_fix-
nt-v2.patch]
[attachment:trac_12848-posets-modifications.patch]
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12848#comment:25>
Sage <http://www.sagemath.org>
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