[petsc-users] How to get number of local nonzeros of a matrix?

[Jed Brown]

On Thu, Dec 29, 2011 at 13:32, Matthew Knepley <knepley at gmail.com> wrote:

> We do nto recommend it, but you can use
> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatGetColumnIJ.html
>

Or, more likely,

http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatGetRowIJ.html


But the matrices are not actually stored this way, so calling this function
involves a copy.
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