[petsc-users] VecScatter

[Jed Brown]

On Wed, Aug 3, 2011 at 04:08, Mohammad Mirzadeh <mirzadeh at gmail.com> wrote:

> I have a question regarding the VecScatter routine. If I make a call like:
>
> VecScatterCreate(old_vec, PETSC_NULL, new_vec, is_scat, &vec_scat);
>

This creates map from the entire old_vec to the subset of new_vec indexed by
the global indices is_scat.


> VecScatterBegin(vec_scat, old_vec, new_vec, INSERT_VALUES,
> SCATTER_FORWARD);
> VecScatterEnd(vec_scat, old_vec, new_vec, INSERT_VALUES, SCATTER_FORWARD);
>
> what is it that will happen? Does this takes the values of old_vec vector
> and put them into new_vec and takes care of all communications?
>

Yes, they go into new_vec according to the global indices is_scat.
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