Comment #3 on issue 3180 by [email protected]: Evaluate expressions containing ImmutableMatrix by default
http://code.google.com/p/sympy/issues/detail?id=3180
There should be some kind of way to not absorb prefactors inside matrices of some kind. At the moment ImmutableMatrix() allows to not automatically absorb prefactors and calling Matrix() on the result will absorb the prefactor. I really can use this behavior. That prefactors are absorbed automatically for Add is only true for Integer prefactors, and in this regard it is a bit of a strange behavior. Fortunately, I can back the common factor out with factor(). I didn't find any factor() function for matrices. I would rather keep the current behavior until an alternative is present.
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