Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium EasyToFix smichr
New issue 2731 by [email protected]: zeros(3,0)*zeros(0,3) should give
zeros(3,3)
http://code.google.com/p/sympy/issues/detail?id=2731
zeros(3,0)*zeros(0,3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\matrices\matrices.py", line 396, in __mul__
return matrix_multiply(self,a)
File "sympy\matrices\matrices.py", line 2642, in matrix_multiply
return Matrix(A.shape[0], B.shape[1], lambda i, j:
File "sympy\matrices\matrices.py", line 76, in __init__
self.mat.append(sympify(operation(i, j)))
File "sympy\matrices\matrices.py", line 2646, in <lambda>
blst[j])))
TypeError: reduce() of empty sequence with no initial value
From the wikipedia page on Matrix,
http://en.wikipedia.org/wiki/Matrix_(mathematics)#Empty_matrices
For example, if A is a 3-by-0 matrix A and B is a 0-by-3 matrix, then AB is
the 3-by-3 zero matrix corresponding to the null map from a 3-dimensional
space V to itself, while BA is a 0-by-0 matrix.
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