#5625: group cohomology -- bad error messages; should indicate an optional
package
is needed
--------------------------+-------------------------------------------------
Reporter: was | Owner: joyner
Type: defect | Status: new
Priority: major | Milestone: sage-3.4.1
Component: group_theory | Keywords:
--------------------------+-------------------------------------------------
The following fails because I don't have the optional gap_packages-*
package installed:
{{{
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(3,4)]])
sage: G.cohomology(1,3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/Users/wstein/.sage/sage_notebook/worksheets/admin/59/code/369.py", line
8, in <module>
G.cohomology(_sage_const_1 ,_sage_const_3 )
File "/Users/wstein/build/sage-3.4/local/lib/python2.5/site-
packages/SQLAlchemy-0.4.6-py2.5.egg/", line 1, in <module>
File "/Users/wstein/build/sage-3.4/local/lib/python2.5/site-
packages/sage/groups/perm_gps/permgroup.py", line 1132, in cohomology
L = eval(gap.eval("GroupCohomology(%s,%s,%s)"%(GG,n,p)))
File "/Users/wstein/build/sage-3.4/local/lib/python2.5/site-
packages/sage/interfaces/gap.py", line 479, in eval
result = Expect.eval(self, input_line, **kwds)
File "/Users/wstein/build/sage-3.4/local/lib/python2.5/site-
packages/sage/interfaces/expect.py", line 974, in eval
return '\n'.join([self._eval_line(L, **kwds) for L in code.split('\n')
if L != ''])
File "/Users/wstein/build/sage-3.4/local/lib/python2.5/site-
packages/sage/interfaces/gap.py", line 723, in _eval_line
raise RuntimeError, message
RuntimeError: Gap produced error output
Variable: 'GroupCohomology' must have a value
executing GroupCohomology(Group([(3,4), (1,2,3)(4,5)]),1,3);
}}}
The error message should say that I have to install that package.
Incidentally, installing the package doesn't work right now since Sage
ships gap-4.12 (though I guess we're downgrading to 4.10 soon):
{{{
$ sage -i gap_packages-4.4.10_6
...
boom
mkdir: /Users/wstein/build/sage-3.4/local/lib/gap-4.4.10: No such file or
directory
cp: directory /Users/wstein/build/sage-3.4/local/lib/gap-4.4.10/pkg does
not exist
Error copying SPKG.txt
real 0m0.078s
user 0m0.007s
sys 0m0.019s
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5625>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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