I am sorry as my question is not clear enough.
What I mean is when we loop over all degree of freedom in a cell, for
example,
for (unsigned int i = 0; i < dofs_per_cell; ++i) { .......... }
Do we have any method to get the position of the i_th degree of
freedom inside this loop?
I would like to thank you very much!
Best,
Pham Ngoc Kien
Vào Th 3, 19 thg 2, 2019 vào lúc 14:47 Phạm Ngọc Kiên <
ngockien.lea...@gmail.com> đã viết:
> Hi,
> I have tried with the methods described in the FAQ and figured out that:
> 1. As I used edge-based element (FE_NedelecSZ), I queried if my element
> had support points by *fe.has_support_points()*. As a consequence, it
> returned zero.
> The *FiniteElement::get_unit_support_points() *also returned an empty
> vector.
> As there was no support point, DoFTools::map_dofs_to_support_points()
> could not work as you mentioned above.
>
> 2. I have tried some thing with the third method. And here-below is my
> code:
>
> Point<dim> p{0.5,0.5,0.5}; //position in reference cell
> Quadrature<dim> q(p);
> FEValues<dim> fe_values_q(fe, q, update_quadrature_points);
> fe_values_q.reinit(cell);
>
> //position in the real cell
> std::vector<Point<dim>> dof_pos = fe_values_q.get_quadrature_points();
> for (int k = 0; k <dof_pos.size() ; ++k) {
> for (int j = 0; j <dim ; ++j) {
> std::cout<<dof_pos[k][j];
> std::cout<<"\n";
> }
> }
>
> From this codes, I can get the real position of arbitrary points in my
> current reference cell.
>
> However, my purpose is to get the real position of a given degree of freedom.
>
> Could you please tell me how to get the position of a degree of freedom in
> the reference cell?
>
> Thank you very much for your help.
>
> Best,
>
> Pham Ngoc Kien
>
>
> Vào Th 3, 19 thg 2, 2019 vào lúc 11:47 Phạm Ngọc Kiên <
> ngockien.lea...@gmail.com> đã viết:
>
>> Yes, thank you very much.
>> I will dig deeper into this.
>> Best,
>> Pham Ngoc Kien
>>
>> Vào Th 3, 19 thg 2, 2019 vào lúc 11:23 Bruno Turcksin <
>> bruno.turck...@gmail.com> đã viết:
>>
>>> Pham Ngoc Kien,
>>>
>>> Le lun. 18 févr. 2019 à 19:33, Phạm Ngọc Kiên <ngockien.lea...@gmail.com>
>>> a écrit :
>>>
>>>> With the DoFTools::map_dofs_to_support_points() , I saw in the library
>>>> manual that it can be used with no edge elements or the like.
>>>> As my finite element is edge-based one, I wonder if this function work?
>>>>
>>> No the function won't work but there are two other methods described in
>>> the FAQ that you could use. In particular, you can create a special
>>> quadrature at the points of interest.
>>>
>>> Best,
>>>
>>> Bruno
>>>
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