[petsc-users] Equivalent of VecScatter for index sets

[Matthew Knepley]

On Mon, Jan 13, 2014 at 9:47 AM, Rémi Lacroix <remi.lacroix at inria.fr> wrote:

> Hello,
>
> I would like to permute an index set with another index set, just like you
> can do for vectors using VecScatter.
>
> I have two index sets IS1 and IS2 which share the same size but have
> different parallel layouts. I often need to permute vectors/matrices using
> those two index sets (as in first permute with IS1 then permute the result
> with IS2). Since I don't use the intermediate result, I would like to
> permute IS1 with IS2 to get a new index set so that I can permute directly
> my vectors/matrices with it. Is that possible using Petsc?
>

We do not have this particular composition in our interface. However, you
could accomplish this using PetscSF.

  Thanks,

     Matt


> I'm not sure I am clear so feel free to ask for clarifications if need be.
>
> Best regards,
>
> --
> Rémi Lacroix
> Équipe ALPINES
> Inria Paris-Rocquencourt / Laboratoire Jacques Louis Lions, UPMC
>
>


-- 
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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