Re: [deal.II] evaluating basis functions at random points

[Daniel Arndt]

Andrea,

have a look at GridTools::compute_point_locations(
https://www.dealii.org/developer/doxygen/deal.II/namespaceGridTools.html#a8e8bb9211264d2106758ac4d7184117e
).
Step-60 demonstrates its use.

Best,
Daniel

Am Mo., 13. Dez. 2021 um 16:14 Uhr schrieb Andrea Bonito :

> Howdy:
>
> this might be a simple question but I do not seem to find a way to
> efficiently evaluate basis functions at random points. More precisely, I am
> given random points in my computational domain and I need to assemble the
> terms
>
> phi_i(p) phi_j(p)  for all random points p and all i,j =1,..., n_dofs.
>
> As of now, I am going cell by cell and check whether p is inside the cell
> (including the boundary). If it is, I am creating a quadrature with one
> point in the reference cell (using the mapping).
>
> I am sure one of you has a better way... any help would be appreciated.
>
> Andrea
>
> --
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> 
> .
>

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[deal.II] evaluating basis functions at random points

[Andrea Bonito]

Howdy:

this might be a simple question but I do not seem to find a way to 
efficiently evaluate basis functions at random points. More precisely, I am 
given random points in my computational domain and I need to assemble the 
terms 

phi_i(p) phi_j(p)  for all random points p and all i,j =1,..., n_dofs. 

As of now, I am going cell by cell and check whether p is inside the cell 
(including the boundary). If it is, I am creating a quadrature with one 
point in the reference cell (using the mapping).

I am sure one of you has a better way... any help would be appreciated.

Andrea

-- 
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