Comment #15 on issue 2020 by mrock...@gmail.com: Symbols & Matrices http://code.google.com/p/sympy/issues/detail?id=2020
No, inclusion of the MatrixExpr class does not handle all of the desired cases.
In particular MatrixExprs do not play nice with the SymPy Matrix object. This desire was present in the basic design but the "Matrices are not Basic" issue stopped most development (I think this is what happened, my memory is hazy here.)
I'd be hesitant to try to mash them together unless there was a pressing need. I'd push for a general reorganization of the Matrix class structure before attempting this.
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