Comment #5 on issue 860 by [email protected]: vectors substitution
http://code.google.com/p/sympy/issues/detail?id=860

sympify(matrix) -> matrix.applyfunc(sympify) breaks matrix code.
Tests give two fails in matrices.

We have two ways to go about this.

1) Add Matrix to Mul, Pow, etc.. Make such classes recognize Matrix as a type of object. This is an inelegant method though.

2) Make Matrix subclass Basic. I have raised an RFC regarding this in the list.

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