#12140: Symmetric functions uses lrcalc in symmetrica and bug fix in skew Schur
function indexed by [[], []]
------------------------------------+---------------------------------------
Reporter: zabrocki | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.2
Component: combinatorics | Resolution:
Keywords: sf, days38, sd40 | Work issues:
Report Upstream: N/A | Reviewers: Anne Schilling
Authors: Mike Zabrocki | Merged in:
Dependencies: 11563 | Stopgaps:
------------------------------------+---------------------------------------
Changes (by {'newvalue': u'Mike Zabrocki', 'oldvalue': u'Mike Zabrocki, Florent
Hivert'}):
* status: needs_work => needs_review
* author: Mike Zabrocki, Florent Hivert => Mike Zabrocki
* dependencies: => 11563
* milestone: sage-5.3 => sage-5.2
* keywords: sf, days38 => sf, days38, sd40
Old description:
> The following code causes a segmentation fault:
>
> {{{
> sage: s = SFASchur(QQ)
> sage: s([[], []])
> }}}
>
> I found this error because I was computing a sum with the skew_by
> operation
>
> {{{
> sage: s([]).skew_by(s([]))
> }}}
>
> which should be s[] but instead causes the segmentation fault.
>
> Apply [attachment:trac_12140_skewschurfix-mz.patch]
New description:
This patch switches computations in symmetric functions from symmetric to
lrcalc which is now standard package in Sage.
In addition, this patch fixes the following bug which causes a
segmentation fault:
{{{
sage: s = SFASchur(QQ)
sage: s([[], []])
}}}
I found this error because I was computing a sum with the skew_by
operation
{{{
sage: s([]).skew_by(s([]))
}}}
which should be s[] but instead causes the segmentation fault.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12140#comment:14>
Sage <http://www.sagemath.org>
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