Comment #10 on issue 2222 by [email protected]: Matrix([Matrix, ...]) should check the row length of empty matrices
http://code.google.com/p/sympy/issues/detail?id=2222
I suppose Alexey means slicing, and indeed slicing with an empty slice (e.g. M[2:2, :5]) should return an empty matrix with the right size (0 * 5 in the previous example).
More generally, allowing empty matrices turns the concatenation operation on matrices into a monoid, which is convenient and has no obvious drawback.
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