Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Matrices
New issue 4102 by [email protected]: Matrix addition does NOT preserve
matrix shape
http://code.google.com/p/sympy/issues/detail?id=4102
Example:
In [13]: A = ones((0,1))
In [14]: B = ones((0,1))
In [15]: A
Out[15]: Matrix(0, 1, [])
In [16]: B
Out[16]: Matrix(0, 1, [])
In [17]: A+B
Out[17]: Matrix(0, 0, [])
While the other way round it works:
In [18]: At = ones((1,0))
In [19]: Bt = ones((1,0))
In [20]: At
Out[20]: Matrix(1, 0, [])
In [21]: Bt
Out[21]: Matrix(1, 0, [])
In [22]: At + Bt
Out[22]: Matrix(1, 0, [])
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