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

[Matthew Knepley]

On Thu, Dec 29, 2011 at 1:28 PM, Junchao Zhang <junchao.zhang at gmail.com>wrote:

> Hello,
>   I create a MPIAIJ matrix.  How can I know the # of nonzeros stored
> locally?
>   Furthermore, in case it is needed, how can I get access to the Compress
> Sparse Row(CSR) data structure of the local matrix, i.e., the row pointer
> array, column index array, value array?
>

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

   Matt


>
>   Thank you!
> -- Junchao Zhang
>



-- 
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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