Comment #4 on issue 4114 by [email protected]:
ImmutableMatrix.is_zero is always False
http://code.google.com/p/sympy/issues/detail?id=4114
Well, MatrixExpr does define is_ZeroMatrix as False, but the camelcasing
implies to me that it's specifically referring to the subclass ZeroMatrix,
rather than just a matrix of zeros. But implenting an is_zero_matrix could
be a sensible alternative. I could just set it be the same as the existing
MatrixBase.is_zero property, then it would propagate down through all the
subclasses unhindered. Any objections or other thoughts to this?
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