[MATRIX-SIG] matrix product in NumPy

[Konrad Hinsen]

> This is a very simple question.
> Given two arrays: a = M x N and b = N x P
> How do I compute:
>  c = ab, such that c = M x P.
> The is the simple matrix product.
> 
> The function Numeric.dot, only seems to work
> for arrays of the same size a = M x N and b = M x N

If you use the latest version of NumPy, then dot() should do
what you want. In earlier versions, dot() calculated the
product between a and the *transpose* of b. The standard
matrix product was calculated by matrixmultiply() and that
function rests for compatibility (but is exactly equal to dot()
now).
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Konrad Hinsen                          | E-Mail: hinsen@ibs.ibs.fr
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