Comment #3 on issue 2544 by asmeurer: Matrix(...)[i] for non-vector matrices should not be supported.
http://code.google.com/p/sympy/issues/detail?id=2544
I admit I've used Matrix()[i], but mainly because I usually can't figure out the normal slicing.
I agree with Ronan. Matrix() should emulate exactly numpy's slicing syntax. They've thought about this much more than we have, and from what I've seen, they have a very powerful and consistant slicing syntax. Furthermore, it will be easier for people who know numpy to use Matrix if it uses the same syntax.
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