[petsc-users] MatGetDiagonal

[Nachiket Gokhale]

Thanks, I guess I misinterpreted the manual.

-Nachiket

On Wed, Jan 23, 2013 at 11:20 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
> It works in serial. In parallel, it currently gives the diagonal of the
> "diagonal blocks" induced by the row and column distributions. That only
> matches the true diagonal for square matrices, though an actual diagonal
> doesn't typically make algorithmic sense for a non-square parallel matrix.
>
>
> On Wed, Jan 23, 2013 at 10:16 AM, Nachiket Gokhale <gokhalen at gmail.com>
> wrote:
>>
>> Any chance of making this work in serial?
>>
>>
>> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatGetDiagonal.html
>>
>> Not a show stopper, I am trying to get the diagonal  of some small
>> projected, dense matrices (which come from large sparse matrices).  I
>> am running in serial because 1) Since my projected matrices are small,
>> and 2) PETSc does not do certain matrix multiplications involving a
>> dense matrix in parallel,
>>
>> -Nachiket
>
>