[petsc-users] Obtain the precondioned matrix

Matthew Knepley knepley at gmail.com
Thu Mar 22 19:41:26 CDT 2018

On Thu, Mar 22, 2018 at 8:29 PM, 我 <dayedut123 at 163.com> wrote:

> Hi all,
> I want to analyze the preconditioned matrix. But the
> KSPComputeExplicitOperator costs too much time to obtain the matrix. My
> origin matrix is about 3000*3000 sparse one. I noticed this function is
> applicable for the relative small system. What's the matrix-size limitation
> for this function? And for my case, any suggestions to solve it with less
> time?

This is just a really expensive operation. There is no way around it.


> Thank you very much!
> daye

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

https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
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