[petsc-users] ISAllGather withoutduplicates

[Matthew Knepley]

On Fri, Feb 17, 2012 at 2:39 PM, Blaise Bourdin <bourdin at lsu.edu> wrote:

> The way I do it right now is
>>  ierr = ISGetTotalIndices(csIS,&labels);CHKERRQ(ierr);
>>  ierr = ISGetSize(csIS,&num_cs_global);CHKERRQ(ierr);
>>
>
> I would violate PETSc semantics here since you are going to destroy csIS
> anyway:
>
>
>   PetscSortRemoveDupsInt(&num_cs_global, labels);
>
>      PetscSortRemoveDupsInt(&num_cs_global, (PetscInt *) labels);

      Matt


> That's what I was thinking too, but PetscSortRemoveDupsInt expect a
> PetscInt* not a const PetscInt*
>
> It's not a big deal, I can live with the 2 copies, considering that the
> local size of the IS is going to be quite small.
>
> Blaise
>
>
>
>
>   ISCreateGeneral(comm, num_cs_global, labels, PETSC_COPY_VALUES,
> &csIS_global);
>
>
>>  ierr = ISRestoreTotalIndices(csIS,&labels);CHKERRQ(ierr);
>>
>
>    Matt
>
>
>>
>> Blaise
>> --
>> Department of Mathematics and Center for Computation & Technology
>> Louisiana State University, Baton Rouge, LA 70803, USA
>> Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276
>> http://www.math.lsu.edu/~bourdin
>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> 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
>
>
> --
> Department of Mathematics and Center for Computation & Technology
> Louisiana State University, Baton Rouge, LA 70803, USA
> Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276
> http://www.math.lsu.edu/~bourdin
>
>
>
>
>
>
>
>


-- 
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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