[petsc-users] about array in VecCreateMPIWithArray()

[recrusader]

Thanks, Matt.

If I have one array, each processor has a copy of all the values.
one possible option is
VecCreateMPI();
VecSetValues();
VecAssemblyBegin();
VecAssemblyEnd();

any better idea?

if I have one array, only one processor has a copy of all the values.
How to generate a MPI vector?

Best,
Yujie

On Fri, Apr 13, 2012 at 10:38 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Fri, Apr 13, 2012 at 11:37 AM, recrusader <recrusader at gmail.com> wrote:
>
>> Dear PETSc developers,
>>
>> my question is what type of array is need for VecCreateMPIWithArray?
>> it is parallel distributed, that each processor holds local values of the
>> array? or each processor has a copy of all the values of the array?
>>
>>
> Only local values.
>
>    Matt
>
>
>> PetscErrorCode  VecCreateMPIWithArray(MPI_Comm comm,PetscInt n,PetscInt N,const PetscScalar array[],Vec *vv)
>>
>> I didn't find more information about the array from the manual.
>>
>> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecCreateMPIWithArray.html
>>
>> Thanks a lot,
>> Yujie
>>
>
>
>
> --
> 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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