Status: Accepted
Owner: asmeu...@gmail.com
Labels: Type-Defect Priority-Medium WrongResult Matrices
New issue 2759 by asmeu...@gmail.com: Implement the forumlas from the
matrix cookbook
http://code.google.com/p/sympy/issues/detail?id=2759
See http://orion.uwaterloo.ca/~hwolkowi/matrixcookbook.pdf. These should
all be implemented, e.g., with MatrixExpr. In particular, currently
differentiation with respect to matrices is wrong because it doesn't handle
transposes correctly. For example, compare the output of this to that in
the cookbook:
In [88]: A = MatrixSymbol("A", n, n)
In [89]: x = MatrixSymbol("x", n, 1)
In [90]: diff(A.T*x, x)
Out[90]: A'
According to equation 61 in the cookbook, this should just be A.
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