Comment #6 on issue 2244 by [email protected]: N(Matrix) does not work
(but Matrix.evalf() does)
http://code.google.com/p/sympy/issues/detail?id=2244
Matrix is not Basic so lots of built-in SymPy functions can not be expected
to work on it.
ImmutableMatrix is Basic, so many of these functions work for free.
Ideally sympify(Matrix) would produce an ImmutableMatrix, which would give
Matrix implicit access to all of these functions. This produces issues
because there are times when you don't want to sympify Matrices
See https://groups.google.com/forum/?fromgroups#!topic/sympy/ERK-YtnxuJw
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