Comment #12 on issue 388 by asmeurer: NotImplementedError in matrices http://code.google.com/p/sympy/issues/detail?id=388
If you think that is the fix, you can test it by making that change in the code then running "./setup.py test", which will run the test suite. If there are no failures, chances are that your fix isn't really so bad (because if it breaks something, it should show up in the tests).
And I think the reason for the current state is that no one got around to implementing it ;)
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