[petsc-users] multiplication with sparse vector ?

Matthew Knepley knepley at gmail.com
Mon Feb 22 06:47:51 CST 2010

PETSc does not do this. You would have to be very sparse to beat BLAS, and
then the algorithms change drastically.


On Mon, Feb 22, 2010 at 1:00 AM, Zhifeng Sheng - EWI <Z.Sheng at tudelft.nl>wrote:

>  Dear all
> I would like to multiply a matrix with a vector that has only a few zeros,
> and I wonder if petsc would take this into account and skip all the
> unnecessary computation with zeros?
> Thanks and best regards
> Zhifeng

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