[petsc-dev] aij and baij data access

[Matthew Knepley]

On Tue, Feb 4, 2014 at 10:01 AM, Jose David Bermeol <jbermeol at purdue.edu>wrote:

> Looking the code for MatGetRowIJ_SeqAIJ_Inode_Nonsymmetric, it is copying
> the data and I want to avoid that. So, is there other way to do this??
>

Turn off inodes.

   Matt


> ----- Original Message -----
> From: "Matthew Knepley" <knepley at gmail.com>
> To: "Jed Brown" <jed at jedbrown.org>
> Cc: "Jose David Bermeol" <jbermeol at purdue.edu>, "petsc-dev" <
> petsc-dev at mcs.anl.gov>
> Sent: Tuesday, February 4, 2014 9:21:34 AM
> Subject: Re: [petsc-dev] aij and baij data access
>
>
>
>
> On Tue, Feb 4, 2014 at 7:41 AM, Jed Brown < jed at jedbrown.org > wrote:
>
>
> Matthew Knepley < knepley at gmail.com > writes:
>
> > On Mon, Feb 3, 2014 at 10:22 AM, Jose David Bermeol <
> jbermeol at purdue.edu >wrote:
> >
> >> Hi, Is it possible to access to the raw data of aij matrices(row
> indices,
> >> column indices and data). I need to used for and optimize algorithm,
> this
> >> data will keep constant all the time. So is it cossible with the public
> >> interface you have or not??
> >>
> >
> > This is a question for petsc-maint.
>
> I disagree; there is no reason to keep such questions private.
>
>
>
> Let me rephrase: This is a question for petsc-maint (my default suggestion
> so as not to force
> people into the public) or petsc-users, not petsc-dev which is for
> development discussion.
>
>
>
>
> >
> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatGetColumnIJ.html
>
> You actually want MatGetRowIJ because MatGetColumnIJ is expensive with a
> row-based format like AIJ.
>
>
>
> Yes, bad click.
>
>
> Matt
>
>
> >
> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatSeqAIJGetArray.html
>
>
>
>
> --
> 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
>



-- 
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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