[dune-fem] LocalFunctionAdapter

[Agnese, Marco]

Hi Tobias,
in my function I have a coefficient which is multiplied for an indicator function which takes an entity and return 1 or 0. 
Therefore I need the information about the entity since the coordinate alone is not sufficient.

Honestly I don't know what is  the DiscreteFunctionAdapter. 
The only ones I found are the GridFunctionAdapter and the LocalFunctionAdapter. For this reason I would like to add the AnalyticalFunctionAdapter to simplify the usage with a c++ function. 

Cheers,
Marco.
________________________________________
From: Tobias Malkmus [tomalk at mathematik.uni-freiburg.de]
Sent: Friday, June 05, 2015 1:47 PM
To: Agnese, Marco; dune-fem at dune-project.org
Subject: Re: [dune-fem] LocalFunctionAdapter

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Hi Marco

One small question from my side. What is the usage of entity in your
"do stuff" part?

If you need it just to get the global coordinates, you should use the
grid function adapter on top of a wrapper around your c++ function.

IF you acctually need more informations from the entity, then you
should use the DiscreteFunctionAdapter, which Andreas mentioned.

By the way, where can i find this within fem ? The grep for
DiscreteFuncitonAapter results in :

./dune/fem/function/common/localfunctionadapter.hh:14:    /**
@addtogroup DiscreteFunctionAdapter
./dune/fem/function/common/localfunctionadapter.hh:16:        Similar
to DiscreteFunctionAdapter but here we provide a LocalFunction
./dune/fem/function/common/localfunctionadapter.hh:35:    //! traits
of DiscreteFunctionAdapter

But there is no such class.


Best Tobias


On 06/05/2015 02:24 PM, Agnese, Marco wrote:
> Hi Andreas, to recap the class LocalAnalyticalFunction which I
> implemented simply store a reference to a C++ function
>
> RangeType f(const DomainType& x,const double& t,const EntityType&
> entity) { //do stuff }
>
> and add all the necessary types/methods in such a way you can pass
> it to the LocalFunctionAdpater to obtain a GridFunction.
>
> I would like to add a class AnalyticalFunctionAdapter do Dune-Fem
> that takes a C++ function and return a GridFunction (using the
> aforementioned LocalAnalyticalFunction and LocalFunctionAdapter).
>
> In this way would be very handy for everybody to transform the c++
> fucntion f into a GridFunction.
>
> Cheers, Marco. _______________________________________________
> dune-fem mailing list dune-fem at dune-project.org
> http://lists.dune-project.org/mailman/listinfo/dune-fem
>
>


- --
Tobias Malkmus                 <tomalk at mathematik.uni-freiburg.de>

Mathematisches Institut               Tel: +49 761 203 5627
Abt. für Angewandte Mathematik        Universität Freiburg
Hermann-Herder-Str. 10
79104 Freiburg

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