[petsc-dev] viewing factored matrices

[Matthew Knepley]

On Fri, Nov 22, 2013 at 10:33 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   Hmm, since under normal usage the factored matrix is owned by one of the
> PCFactor subclass objects do we actually want the PCFactor subclass to
> manage the viewing of them from the command line and not the “Mat” directly
> ? Something like   -pc_factor_mat_view xxx    ?    I think this approach
> would lead to clean simple code, while trying to force it through the
> MatSetFromOptions() to get the viewer would be convoluted since the
> factored matrix may not exist when PCSetFromOptions() is called and
> creating that matrix early (while possible) doesn’t seem the right model. I
> prefer -pc_factor_mat_xxx options rather than -mat_xx options for anything
> related to the factored matrix.
>

So I assume you would have PCFactor set the prefix of the matrix to
prefix+"pc_factor_" and call MatViewFromOptions() inside the PCView()?

   Matt


>   Sound ok?
>
>    Barry
>
>
> On Nov 22, 2013, at 9:59 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
> > Barry, at some point in your of Mat viewers, factored matrices became
> > disconnected form -mat_view.  PCLU does not call MatSetFromOptions() on
> > the factored matrix and we don't want to do a MatSetFromOptions() on
> > each iteration.  Should MatGetFactor() be restructured to take a Mat
> > that has already been created, so that it can have options set once?
>
>


-- 
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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