Comment #3 on issue 3401 by [email protected]: Slicing an empty matrix is
broken
http://code.google.com/p/sympy/issues/detail?id=3401
It should fail: you can't request a 0 element if there are no elements
there, e.g.
[][0] fails, too.
The following doesn't fail, however:
Matrix(0,3,[])[:,:]
[]
Matrix(1,3,range(3))[0,0]
0
Matrix(1,3,range(3))[:,0]
[0]
The behavior or ":" when applied to a sequence of length 0 is
Python-consistent:
slice(None,None).indices(0)
(0, 0, 1)
slice(None,None).indices(1)
(0, 1, 1)
slice(None,None).indices(10)
(0, 10, 1)
I would mark this as WontFix, but I'll leave it open for further comment.
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