[dune-fem] Number of elements refined/coarsened

[Claus-Justus Heine]

On 20.06.2013 23:41, Claus-Justus Heine wrote:
> On 20.06.2013 23:25, Dedner, Andreas wrote:
>> Do you really need to know how many elements where coarsend and how many added or only
>> the net change - because for that you have size methods on the grid itself - for that I can give you a two line
>> code :-)
>> int oldSize = gridPart.grid().size(0).
>> adaptManager.adapt();
>> int newSize = gridPart.grid().size(0);
>> int change = newSize - oldSize;
> 
> Nice. For completeness: these are the numbers for the current computing
> node?,I would have to collect the element numbers by some construct like
> 
> size_t oldSize = gridPart.grid().size(0);
> oldSize = gridPart.grid().comm().sum(oldSize);

... and better use "ssize_" or "int". Although large positive numbers
are just nice ...


> 
> and similar for newSize. And as this "recurses" to gridPart().grid(),
> are these hierarchical elements, or just the leave-level? Not really
> important For me, this is just a debugging aid. The actual number of
> DOFs, elements and so on can be determined during data post-processing
> in a "production environment". So to say.
> 
> Thanks for the Double Quote two-liner Double Quote.
> 
> Best,
> 
> Claus
> 
> 
>> Best
>> Andreas
>> ________________________________________
>> From: dune-fem-bounces+a.s.dedner=warwick.ac.uk at dune-project.org [dune-fem-bounces+a.s.dedner=warwick.ac.uk at dune-project.org] on behalf of Claus-Justus Heine [Claus-Justus.Heine at ians.uni-stuttgart.de]
>> Sent: 20 June 2013 22:14
>> To: dune-fem at dune-project.org
>> Subject: [dune-fem] Number of elements refined/coarsened
>>
>> Again outing myself as a Dune green-horn. In ALBERTA there is some nice
>> output (optional output) about the number of elements actually coarsened
>> and refined during mesh adaptation. Rationale: this is different from
>> the number of marked elements on conformal grids, which need to refine
>> more elements to arrive at their conformal closure, and also the
>> coarsening of elements will be abandoned if the conforming neighbor is
>> not marked for coarsening as well. Has someone a "two-lines" code
>> example of how to achieve this in Dune respectively Dune::Fem?
>>
>> Thanks for any answer in advance.
>>
>> Claus
>>
>>
>> --
>> Dr. Claus-Justus Heine
>> Institut für Angewandte Analysis und Simulation
>> * Numerische Mathematik für Höchstleistungsrechner
>> Universität Stuttgart
>>
>> Fon: +49 (0) 711 - 685 65558
>> Fax: +49 (0) 711 - 685 65507
>>
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> 
> 


-- 
Dr. Claus-Justus Heine
Institut für Angewandte Analysis und Simulation
* Numerische Mathematik für Höchstleistungsrechner
Universität Stuttgart

Fon: +49 (0) 711 - 685 65558
Fax: +49 (0) 711 - 685 65507