[petsc-users] Fwd: matrix dot product multiplication with petsc

Matthew Knepley knepley at gmail.com
Mon Jul 23 21:20:31 CDT 2012

On Mon, Jul 23, 2012 at 9:18 PM, Nicholas Pezolano <npezolano at gmail.com>wrote:

> @Matt,
>  thanks but this is just general matrix multiplication , not the dot
> product multiplication's for a matrix

Please explain to me the difference.


> @Jed Brown
> I am trying to draw random numbers from a complex multivariate mixture
> distribution needed for a monte carlo simulation.  X:= mu + Lambda.* W +
> gamma.*sqrt(W) , where they are all NxN dense matrices of equal size  where
> N ranges from 100,000 to 2,000,000. I need to do the dot product
> multiplication and addition for every part of this distribution. Would
> petsc be the right tool for this or should i just stick to C and mpi. I've
> already used many petsc functions that have made life much eaiser

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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