Comment #1 on issue 3714 by [email protected]: as_real_imag (and
friends) for noncommutatives
http://code.google.com/p/sympy/issues/detail?id=3714
For matrices, it seems reasonable to use applyfunc().
For other non-commutative objects, sometimes - re() and im() can be
meaningful. E.g. for quaternions. But *not* as_real_imag(). I think, we
should just raise an exception here.
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