[Numpy-discussion] matrix multiplication A x, x has some zeros

Charles R Harris charlesr.harris@gmail....
Fri Dec 14 03:37:31 CST 2007


How big is n?

On Dec 14, 2007 1:24 AM, dmitrey <dmitrey.kroshko@scipy.org> wrote:

> Hi all,
> I have to get Ax, A  is n x n matrix, x is vector of length n.
> Some coords of x are zeros, so I want to economy time/cputime somehow
> w/o connecting sparse module from scipy.
> What's the easiest way to do so?
>
> Thx, D.
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