Dear Daniel
Thank you. You really help me.
Best,
Pasha
On Friday, July 1, 2016 at 5:21:08 PM UTC+4:30, Daniel Arndt wrote:
>
> Pasha,
>
> First of all: The sum of values in the right-hand side vector only
> corresponds to a sum of values of the represented right-hand side function,
> if you use interpolating Finite Elements (such as FE_Q).
> Furthermore, you have to be sure that you are really interested in the
> values and not in the integral over the boundary or something similar.
>
> Apart from the last issue you mentioned, your approach seems to be correct
> but is not really efficient.
> For summing up all the values in the right-hand side vector corresponding
> to degrees of freedom on the boundary, you would just want to use your
> inner part with small modifications:
>
> dealii::IndexSet::ElementIterator index = in_set.begin(),
> dealii::IndexSet::ElementIterator endind = in_set.end();
>
> dealii::IndexSet locally_owned_dofs =
> dof_handler.locally_owned_dofs();
>
> for (; index!=endind; ++index)
> {
> dealii::types::global_dof_index gdi = *index;
> // check if this DoF is locally owned
> if (locally_owned_dofs.is_element(gdi))
> local_load -= saved_residual(gdi);
> }
>
> Note that checking whether the DoF is locally owned, you circumvent the
> problem of taking the same DoF in to account multiple times on different
> MPI processes.
>
> Best,
> Daniel
>
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