dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

Anders Logg wrote:
> On Tue, Feb 02, 2010 at 11:20:32PM -0000, noreply@xxxxxxxxxxxxx wrote:
>> ------------------------------------------------------------
>> revno: 4434
>> committer: Garth N. Wells <gnw20@xxxxxxxxx>
>> branch nick: dolfin-all
>> timestamp: Tue 2010-02-02 23:16:44 +0000
>> message:
>>   Set parameter to use tensor rep for DG Poisson demo. It's broken.
>>
>>   This shows that tensor rep is not wotking for DG.
> 
> I think it just shows that the tensor representation does not handle
> FacetNormals 

This sounds to me like a significant deficiency. Is there are technical
reason for this?

or Division which is known.

> Without the -r representation
> option, FFC will automatically discover that the integrand in question
> needs to be done with quadrature

OK, it's good it if can figure this out.

Garth

> but if someone insists on -r tensor,
> then FFC will try and explain why it fails:
> 
>   *** FFC: No handler defined for expression Division.
> 
> I'll switch the demo back to "auto".
> 
> --
> Anders
> 
> 
> 
>> modified:
>>   demo/pde/dg/poisson/python/demo.py
>>
>>
> 
>> === modified file 'demo/pde/dg/poisson/python/demo.py'
>> --- demo/pde/dg/poisson/python/demo.py	2010-01-27 21:09:29 +0000
>> +++ demo/pde/dg/poisson/python/demo.py	2010-02-02 23:16:44 +0000
>> @@ -23,6 +23,8 @@
>>
>>  from dolfin import *
>>
>> +parameters["form_compiler"]["representation"] = "tensor"
>> +
>>  # Create mesh and define function space
>>  mesh = UnitSquare(24, 24)
>>  V = FunctionSpace(mesh, "DG", 1)
>>
> 
> 
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