[deal.II] Writing outputs of type tensor in cells

[shahab.g...@gmail.com]

Dear All,

I have a parameter of type Tensor<1, dim> for each active cell in the 
triangulation. When I write this parameter as output, I face some 
difficulties:
1, Vectors in deal.II do not accept tensor elements.
2, add_data_vector does not work for std::vectors.
3, I tried using DataComponentInterpretation, but I am really confused in 
implementing it correctly.

I would appreciate it if you could send me an example of writing an output 
of type Tensor for each cell. Let's say I have a 
std::vector> output;
, and in this vector I've stored the output parameter in each cell using  
cell->global_active_cell_index(). 

Best
Shahab

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Re: [deal.II] How to add 2nd iterator to MeshWorker::mesh_loop ?

[Sylvain Mathonnière]

Adding the & did the trick indeed. Thank you. Thank you as well for the FAQ 
entry on this. I completely overlooked it...

Best,

Sylvain

El viernes, 16 de julio de 2021 a la(s) 07:22:25 UTC+2, Jean-Paul Pelteret 
escribió:

> To add to what Wolfgang has already said, there’s this entry in our FAQ on 
> this topic:
>
> https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#can-i-convert-triangulation-cell-iterators-to-dofhandler-cell-iterators
>
>
> On 15. Jul 2021, at 17:31, Wolfgang Bangerth  
> wrote:
>
> On 7/15/21 2:45 AM, Sylvain Mathonnière wrote:
>
> *typenameDoFHandler::active_cell_iteratorcell_2 
> (cell_1->get_triangulation(), 
> cell_1->level(), cell_1->index(), dof_handler_2);*
>
>
> The compiler error tells you that you need pointers, not references. So 
> this should work:
>
>  typename DoFHandler::active_cell_iterator
> cell_2 (_1->get_triangulation(), cell_1->level(), cell_1->index(),
> _handler_2);
>
> Best
> W.
>
> -- 
> 
> Wolfgang Bangerth  email: bang...@colostate.edu
>   www: http://www.math.colostate.edu/~bangerth/
>
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> .
>
>
>

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