Hi all,
this creates an error :
sage: G= SymmetricGroup(5)
sage: A= GroupAlgebra(G)
sage: x, y= G.gens()
sage: A ( A(x) )
...
TypeError: Don't know how to create an element of Group algebra of
group "SymmetricGroup(5)" over base ring Integer Ring from (1,2,3,4,5)
although A(x) works. I have tried to do this :
class my_gp_alg(GroupAlgebra):
def __call__(self, x):
try :
ans=
sage.algebras.group_algebra.GroupAlgebra.__call__(self, x)
except TypeError :
ans= x
return ans
which allows me to go A(A(x)), if A= my_gp_algebra(G). However the
following still fails:
sage: gl= MatrixSpace(A, 2)
sage: M= gl([A(x), 0, 0, A(y)])
same error message. The last line would work with x and y instead of
A(x) and A(y), but then there are more errors coming up shortly if i
try to compute anything.
thoughts anyone ?
thanks!
pierre
PS this is sage 4.2.1, i'll try to upgrade (but this takes hours and i
need to use sage right now!)
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