[petsc-dev] Fwd: [petsc-users] Meaning of MatStencil

[Aron Ahmadia]

MatSetValuesBlockedStencil is in Beginner, should it be moved to
Intermediate?

A

---------- Forwarded message ----------
From: Aron Ahmadia <aron.ahmadia at kaust.edu.sa>
Date: Mon, Dec 27, 2010 at 10:44 AM
Subject: Re: [petsc-users] Meaning of MatStencil
To: PETSc users list <petsc-users at mcs.anl.gov>


MatStencil only makes sense if you are using a distributed grid (DA), where
it corresponds to physical field locations.  You probably just want
MatSetValuesBlocked (
http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Mat/MatSetValuesBlocked.html
)

Warm Regards,
Aron


On Mon, Dec 27, 2010 at 10:09 AM, Raeth, Peter <PRaeth at hpti.com> wrote:

>    Am a new PETSc user trying to make use of the matrix level to create
> and operate on matrices whose memory exceeds that available on any one node.
> To populate a distributed dense matrix with results of other matrix
> calculations we are trying to use MatSetValuesBlockedStencil. Two of the
> inputs to that function require structures of type MatStencil. After
> searching the archives, tutorials, examples, and Google, I can not find
> anything that explains what the values of MatStencil are meant to do
> relative to where in the target matrix to place the block of values.
> Would someone please point me in the right direction?
>
> Thanks,
>
> Peter.
>
>
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