#6391: libGAP! -- create a Cython library interface to gap
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Reporter: was |
Owner: was
Type: enhancement |
Status: needs_work
Priority: major |
Milestone: sage-5.0
Component: interfaces |
Resolution:
Keywords: |
Work issues:
Report Upstream: N/A |
Reviewers: Dima Pasechnik, Ivan Andrus, Volker Braun, William Stein
Authors: Dima Pasechnik, Ivan Andrus, Volker Braun, William Stein |
Merged in:
Dependencies: |
Stopgaps:
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Comment (by mmarco):
I have been trying to make my free groups/finitely presented groups (see
#12339) wraper with libgap, and in general it works fine (and an
impressive speed, i must say). There are some random segfauls though. And
i have run into a problem that can be traced down to:
{{{
sage: from sage.libs.gap.all import libgap
sage: F=libgap('FreeGroup(2)')
sage: lis=libgap('[]')
sage: (a,b)=F.GeneratorsOfGroup()
sage: lis.Add(a^2)
sage: lis.Add(b^2)
sage: lis.Add(a*b*a*b)
sage: lis
[ f1^2, f2^2, f1*f2*f1*f2 ]
sage: H=F/lis
sage: H
<fp group on the generators [ f1, f2 ]>
sage: H.IsomorphismSimplifiedFpGroup()
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ValueError Traceback (most recent call
last)
/home/mmarco/sage-4.7.2/<ipython console> in <module>()
/home/mmarco/sage-4.7.2/local/lib/python2.6/site-
packages/sage/libs/gap/libgap.so in
sage.libs.gap.libgap.GapElement_MethodProxy.__call__
(sage/libs/gap/libgap.c:7643)()
/home/mmarco/sage-4.7.2/local/lib/python2.6/site-
packages/sage/libs/gap/libgap.so in
sage.libs.gap.libgap.GapElement_Function.__call__
(sage/libs/gap/libgap.c:7259)()
ValueError: Gap: Aborted
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6391#comment:70>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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