#9894: Group cohomology spkg, version 2.1
----------------------------------------------------------------------------+
Reporter: SimonKing |
Owner: tbd
Type: enhancement |
Status: needs_review
Priority: major |
Milestone: sage-4.6
Component: optional packages |
Keywords: modular group cohomology solaris t2
Author: Simon King |
Upstream: N/A
Reviewer: |
Merged:
Work_issues: Is the code independent of the computer's newline character? |
----------------------------------------------------------------------------+
Comment(by kcrisman):
> Since I can not replicate it on my computer, can you please do/answer
the following?
>
> What version of Sage are you using? What version of Singular is it?
I have no explanation for the following.
{{{
----------------------------------------------------------------------
| Sage Version 4.5.3, Release Date: 2010-09-04 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: singular_version()
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call
last)
/Users/crisman/<ipython console> in <module>()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/sage/interfaces/singular.pyc in singular_version()
1916 EXAMPLES:
1917 """
-> 1918 return singular.eval('system("--version");')
1919
1920
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/sage/interfaces/singular.pyc in eval(self, x, allow_semicolon,
strip, **kwds)
547
548 if s.find("error") != -1 or s.find("Segment fault") != -1:
--> 549 raise RuntimeError, 'Singular error:\n%s'%s
550
551 if get_verbose() > 0:
RuntimeError: Singular error:
? cannot open `help.cnf`
Singular for ppcMac-darwin version 3-1-1 (3114-2010090802) Sep 8 2010
02:24:06
with
factory(@(#) factoryVersion = 3.1.1),libfac(3.1.1,Feb 2010),
GMP(4.2),NTL(5.4.2),32bit,static readline,Plural,DBM,
dynamic modules,OM_NDEBUG,random=1284424481
CC= gcc -O3 -g -fPIC -pipe -DNDEBUG -DOM_NDEBUG -DppcMac_darwin
-DHAVE_CONFIG_H,
CXX= g++ -O3 -g -fPIC -pipe -DNDEBUG -DOM_NDEBUG -DppcMac_darwin
-DHAVE_CONFIG_H (4.0.1 (Apple Computer, Inc. build 5370))
argv[0] : Singular-3-1-1
SearchPath:
/Users/crisman/Desktop/sage-4.5.3/local/share/singular:/Users/crisman/Desktop/sage-4.5.3/local/LIB
Singular : /Users/crisman/Desktop/sage-4.5.3/local/bin/Singular
BinDir : /Users/crisman/Desktop/sage-4.5.3/local/bin
RootDir : /Users/crisman/Desktop/sage-4.5.3/local
DefaultDir: /Users/crisman/Desktop/sage-4.5.3/local
InfoFile :
IdxFile :
HtmlDir :
ManualUrl : http://www.singular.uni-kl.de/Manual/3-1-1
ExDir :
Path :
/Users/crisman/Desktop/sage-4.5.3/local/bin:/Users/crisman/Desktop/sage-4.5.3:/bin:/sbin:/usr/bin:/usr/sbin
EmacsDir :
Available HelpBrowsers: dummy, emacs,
Current HelpBrowser: dummy
? error occurred in or before STDIN line 49965: `system("--version");`
}}}
But as you can see in the error messages, it's the 3.1.1 devel version,
and this works:
{{{
Crismans-Computer:~ crisman$ Desktop/sage-4.5.3/sage -singular
SINGULAR / Development
A Computer Algebra System for Polynomial Computations / version 3-1-1
0<
by: G.-M. Greuel, G. Pfister, H. Schoenemann \ Feb 2010
FB Mathematik der Universitaet, D-67653 Kaiserslautern \
}}}
> Remove your "private cohomology database" in order to be sure that there
is no debris left. You will probably not mind to do it by {{{rm -r
~/.sage/pGroupCohomology/db/*}}} (or you can move the contents of the
folder to a backup location). The folder itself must be present, though.
>
> Do the following in Sage:
> {{{
> sage: from pGroupCohomology import CohomologyRing, _cache
> sage: G = gap('AlternatingGroup(8)')
> sage: H = CohomologyRing(G,prime=2,GroupName='A8')
This fails for me earlier:
{{{
sage: from pGroupCohomology import CohomologyRing, _cache
sage: G = gap('AlternatingGroup(8)')
sage: H = CohomologyRing(G,prime=2,GroupName='A8')
---------------------------------------------------------------------------
IndexError Traceback (most recent call
last)
/Users/crisman/<ipython console> in <module>()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/__init__.pyc in __call__(self, *args, **kwds)
2676 # By now, we have both subgroups and their cohomology
rings.
2677 if not HP.completed:
-> 2678 HP.make()
2679 # not needed for HSyl, since it was computed when we
did it in the computation of HP
2680
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/modular_cohomology.so in
pGroupCohomology.modular_cohomology.MODCOHO.make
(pGroupCohomology/modular_cohomology.c:46208)()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/modular_cohomology.so in
pGroupCohomology.modular_cohomology.MODCOHO.next
(pGroupCohomology/modular_cohomology.c:45211)()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/cohomology.so in
pGroupCohomology.cohomology.COHO.lift_dickson
(pGroupCohomology/cohomology.c:63567)()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/modular_cohomology.so in
pGroupCohomology.modular_cohomology.MODCOHO.PrescribedRestrictions
(pGroupCohomology/modular_cohomology.c:35570)()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/modular_cohomology.so in
pGroupCohomology.modular_cohomology.MODCOHO.decomposable_classes
(pGroupCohomology/modular_cohomology.c:33350)()
/Users/crisman/Desktop/sage-4.5.3/local/lib/python2.6/site-
packages/pGroupCohomology/modular_cohomology.so in
pGroupCohomology.modular_cohomology.MODCOHO.find_relations
(pGroupCohomology/modular_cohomology.c:32768)()
IndexError: list index out of range
}}}
I'll try the reinstall next.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9894#comment:18>
Sage <http://www.sagemath.org>
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