Updates:
Labels: Documentation
Comment #6 on issue 2275 by [email protected]: is_upper and is_lower should
imply that the matrix is square
http://code.google.com/p/sympy/issues/detail?id=2275
Frankly speaking, the documentation still does not emphasize about the
difference between "pure triangular upper (square) " and `upper trapezoidal
matrix` (similar as triangular square but not square).
It is important to note that "upper" method tests and non-square matrices.
And can give True:
Matrix([[1, 2, 3], [0, 2, 4], [0, 0, 1], [0, 0, 0]])
⎡1 2 3⎤
⎢ ⎥
⎢0 2 4⎥
⎢ ⎥
⎢0 0 1⎥
⎢ ⎥
⎣0 0 0⎦
_.is_upper
True
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