[SciPy-User] raising a matrix to float power

Alexey Brazhe brazhe@gmail....
Sat Jul 10 18:57:02 CDT 2010

>Sure, M**0.5 is cho_factor(M). For other non-integers I am not sure what
>matrix exponentiation could possibly mean.

>Are you sure you don't mean array exponentiation?

Indeed, I needed to raise a matrix (not array) to power 1/2 (in fact, -1/2).
More precisely, I need to compute W(W^TW)^(-1/2).
cho_factor fails with "matrix not positive definite", and I don't know how
to avoid that

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