[petsc-users] Symmetric MPIAIJ matrix

[Matthew Knepley]

On Tue, Jul 7, 2015 at 3:22 PM, Bikash Kanungo <bikash at umich.edu> wrote:

> Hi,
>
> Is there a way to ignore the lower (or upper) triangular entries in an
> MATMPIAIJ matrix when I know my matrix is symmetric? I can see a
> MAT_SYMMETRIC option in MatSetOption, but I don't think it ignores any
> lower (or upper) triangular entry.
>

Why do you want this?


> I cannot use MATMPISBAIJ due to MatMatMult incompatibility with MATMPIAIJ.
>

This is the only way. MatMatMult() is quite complex and there is no real
advantage to ignoring
the entries, so we have not implemented it here.

  Matt


> Thanks,
> Bikash
>
> --
> Bikash S. Kanungo
> PhD Student
> Computational Materials Physics Group
> Mechanical Engineering
> University of Michigan
>
>


-- 
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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