Updates:
Status: Fixed
Comment #7 on issue 1168 by smi...@gmail.com: Matrix([[x+y, -x, 0], [-x-y,
x, 1], [0,1,0]]).inf() gives wrong result
http://code.google.com/p/sympy/issues/detail?id=1168
regarding subs of oo: since -oo is a singleton, it is missed by the current
logic of subs.
(x-oo).subs(oo,1)
x - oo
see issue 3059
Regarding the Matrix issue: this appears to work fine now:
A = Matrix([[x+y, -x, 0], [-x-y, x, 1], [0,1,0]])
Ainv = A.inv()
Ainv=Ainv.applyfunc(simplify)
Ainv
[1/(x + y), 0, x/(x + y)]
[ 0, 0, 1]
[ 1, 1, 0]
A
[ x + y, -x, 0]
[-x - y, x, 1]
[ 0, 1, 0]
Ainv*A
[1, 0, 0]
[0, 1, 0]
[0, 0, 1]
(reopen if your results vary)
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