dolfin team mailing list archive

["Dag Lindbo" <dag@xxxxxxxxxx>]

> Shilpa Khatri wrote:
>> I would also like to know how this is done (We are using the c++
>> interface).
>> Thanks,
>> Shilpa
>>
>> On Feb 13, 2008 4:09 PM, Kristen Kaasbjerg <cosby@xxxxxxxxx
>> <mailto:cosby@xxxxxxxxx>> wrote:
>>
>>     Hi,
>>
>>     I have a rather simple question - having obtained a FEM
>>     solution "u" of a given PDE, how does one get the
>>     function value at an arbitrary point "x" (I'm using the
>>     python interface) ?
>>
>>
> This functionality existed in DOLFIN a while ago, but it needs updating
> to new interfaces. Take a look at the old implementation:
>
> http://www.fenics.org/hg/dolfin?f=50aee5576fed;file=src/kernel/function/DiscreteFunction.cpp
>
> The point evaluation function is:
>
> real DiscreteFunction::operator()(const Point& p, uint i)
>
> The significant change that needs to be done is how to compute basis
> functions. This functionality now exists for general finite elements in
> the UFC interface (evaluate_basis()).
>
>   Johan

This is good news. As far as I can tell, the search is handled by a
IntersectionDetector which is mainly a wrapper for GTS. Has the _idetector
member been removed from the DiscreteFunction, or does it come from some
base class?

Dag


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