[petsc-users] VecScatter

[Mohammad Mirzadeh]

Thank you Jed.

On Wed, Aug 3, 2011 at 6:47 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> 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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