[petsc-users] PETSc : how to get back d_nnz and o_nnz ?

[Jed Brown]

HOUSSEN Franck <Franck.Houssen at cea.fr> writes:

> Hello,
>
> From a Mat object (already preallocated with
> MatMPIAIJSetPreallocation), can I get back the d_nnz and o_nnz arrays?

MatMPIAIJGetSeqAIJ(), then MatGetRowIJ().  This returns the offsets
array, so

  nnz[i] = ai[i+1] - ai[i];


Why do you want this low-level information?
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