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

[Junchao Zhang]

Manual of MatGetRowIJ says "Returns the compressed row storage i and j
indices for *sequential *matrices."
Could I pass MPIAIJ matrix as an argument to it?

On Thu, Dec 29, 2011 at 1:34 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> 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.
>



-- 
Junchao Zhang
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