Wasim,
The answer depends very much on what you actually want to do with that
solution vector.
Do you want a representation of the solution (assuming you are using Q1?
nodal elements) on a single process/all processes
or are you just interested in the partial solution on every process
separately?
What you are doing looks quite similar to what DataOut would give you for
visualizing solutions.
Best,
Daniel
On Thu, Apr 6, 2023 at 8:02 AM Wasim Niyaz Munshi ce21d400 <
ce21d...@smail.iitm.ac.in> wrote:
> Hello everyone.
> I want to extract the element solution vector from the global solution
> once the problem is solved in step-40. For a serial code, I would do
> something like this:
>
> *int i=0;*
>
>
>
> *for (const auto vertex : cell->vertex_indices()) { int a =
> (cell->vertex_dof_index(vertex, 0)); element_sol[i] = solution_vector[a];*
>
> * i=i+1; }*
>
> I don't have a solution_vector for a parallel code, but a
> locally_relevant_solution. I want to know that, given this
> locally_relevant_solution and the cell, how do I get the element_sol?
> The global_dof will not be helpful here, as the solution_vector is
> distributed across a number of processors.
>
> Thanks and regards
> Wasim
>
>
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