To add to this, there might also be no reason for cell "4" (whatever
that means) to be available on the current processor. The mesh in a
parallel computation is "distributed" after all.
On Fri, Feb 24, 2017 at 8:01 AM, Jean-Paul Pelteret
<jppelte...@gmail.com> wrote:
> Dear Seyed,
>
> There are no cell "numbers" in deal.II, only CellIDs to give some unique
> identifier to each cell. So its unclear to me as to exactly what you're
> trying to achieve here.
>
> Are you wanting the fourth cell iterator for the entire triangulation, or
> the fourth locally owned cell? Either way, you need to increment your cell
> iterator by however many times you want, taking note that dependent on how
> you do this you may not end up with a locally owned cell. You can increment
> iterators by a given number of times using std::advance, and you may wish to
> consider using FilteredIterators with the LocallyOwned predicate to ensure
> that you always end up with a cell thats valid on the given process.
>
> I hope that this helps,
> Jean-Paul
>
> On Friday, February 24, 2017 at 11:12:59 AM UTC+1, Seyed Ali Mohseni wrote:
>>
>> Hi,
>>
>> Is it possible to access a specific element within a parallel distributed
>> triangulation by means of the following procedure for instance:
>>
>> typename DoFHandler<dim>::active_cell_iterator cell =
>> dof_handler.begin_active(), endc = dof_handler.end();
>>
>> for (; cell != endc; ++cell)
>> {
>> if (cell->is_locally_owned())
>> {
>> std::cout << "CELL NUMBER 4 VERTEX 1: " << cell(4)->vertex(0) <<
>> std::endl;
>> }
>> }
>>
>> The above won't compile.
>>
>> How am I able to access for example element number 4 in order to obtain
>> the coordinates of point 1 within the element.
>>
>> Kind regards,
>> S. A. Mohseni
>>
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--
Timo Heister
http://www.math.clemson.edu/~heister/
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