Comment #1 on issue 3406 by [email protected]: SparseMatrix attribute is incompatible with MatrixBase methods
http://code.google.com/p/sympy/issues/detail?id=3406
(Sorry -- MatrixBase, not MutableMatrix, currently has the .mat property. And since SparseMatrix derives from MatrixBase the problems arise. If the pertinent code from MatrixBase were moved to MutableMatrix and MatrixBase didn't contain the .mat attribute, then everything would be better separated.)
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