Comment #3 on issue 860 by sherjilo...@gmail.com: vectors substitution http://code.google.com/p/sympy/issues/detail?id=860
Solved the sympify problem. Sympify for matrix is now just the matrix itself with its element sympified. I know its not exactly what sympify's job is, but its better than an Error.
To make subs return a proper answer though, matrix multiplication would have to return Mul.
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