ffc team mailing list archive

[Martin Sandve Alnæs <martinal@xxxxxxxxx>]

Ok. Temporarily, maybe you'll be happy with the code
generated by SFC (see the demo/*/cpp/ directories in SyFi).
There both weights and points are embedded directly in the code.

Martin



On Mon, Jun 22, 2009 at 10:50 PM, Shawn Walker<walker@xxxxxxxxxxxxxxx> wrote:
>
>
> On Mon, 22 Jun 2009, Anders Logg wrote:
>
>> I think Shawn just wants to get the quadrature points so he can
>> hand-modify the code for tabulate_tensor to handle higher-order mapped
>> elements (to make a prototype for higher-order elements).
>>
>> Correct me if I'm wrong.
>
> Yes!
>
>> In that case, we won't need to make them available since they are
>> available to the form compiler when the code is being generated, but
>> it would help if they were available in a comment in the generated code.
>
> I agree that having them in a comment would be good.
>
> - Shawn
>
>>
>> On Mon, Jun 22, 2009 at 10:28:29PM +0200, Martin Sandve Alnæs wrote:
>>>
>>> On Mon, Jun 22, 2009 at 9:10 PM, Kristian
>>> Oelgaard<k.b.oelgaard@xxxxxxxxxx> wrote:
>>>>
>>>> Quoting Shawn Walker <walker@xxxxxxxxxxxxxxx>:
>>>>
>>>>> Actually, I am still a little confused.  Whenever you compute an
>>>>> integral
>>>>> by quadrature, you need to evaluate the integrand at the quadrature
>>>>> points.  Those are the points I need.
>>>>
>>>> If you have a quadrature element in your form
>>>>
>>>> element = FiniteElement("Quadrature", triangle, 2)
>>>>
>>>> you can call the
>>>> tabulate_coordinates() function of the dof_map associated with the
>>>> quadrature
>>>> element. If you don't have a quadrature element there is no direct way
>>>> of
>>>> getting the quadrature points.
>>>>
>>>>> I just need the quad rule that is used in a particular case.  I see the
>>>>> weights are defined in the tabulate_tensor routine.  Are the points
>>>>> listed
>>>>> in a comment somewhere?
>>>>
>>>> No, currently not. But it might be a natural thing to have. I'll look
>>>> into it.
>>>
>>> It could be an idea to make it available through UFC,
>>> but then again each ufc::*_integral may use different
>>> quadrature rules for different terms...
>>> However, an exception can be thrown if there is no unique rule in use.
>>>
>>> Martin
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