[petsc-users] Use of DMDAVecGetArrayF90 and DMDAVecRestoreArrayF90

[Matthew Knepley]

On Tue, Nov 10, 2015 at 3:27 AM, TAY wee-beng <zonexo at gmail.com> wrote:

> Hi,
>
> Inside my subroutine, I need to access the DA variable cu_types_array
> frequently.
>
> So I need to call DMDAVecGetArrayF90 and DMDAVecRestoreArrayF90 before and
> after frequently.
>
> Is this necessary? Can I call DMDAVecGetArrayF90 at the start and only
> call DMDAVecRestoreArrayF90 towards the end, where I don't need to modify
> the values of cu_types_array anymore?
>
> Will this cause memory corruption?
>

You cannot use any other vector operations before you have called Restore.


> Also, must the array be restored using DMDAVecRestoreArrayF90 before
> calling DMLocalToLocalBegin,DMLocalToLocalEnd?


Yes.

  Matt


>
> --
> Thank you.
>
> Yours sincerely,
>
> TAY wee-beng
>
>


-- 
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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