[Trilinos-Users] Interfacing fftw and trilinos

[Heroux, Mike]

Romain,

I think Epetra_Operator is might still the right interface.  Please
describe the operation you want to perform and how the data are
distributed across the parallel machine.

Mike 

On 11/28/12 4:36 PM, "Veltz Romain" <romain.veltz at inria.fr> wrote:

>Mike,
>
>I am sorry because I was not clear enough.
>
>My basic goal is to apply a FFT to an Epetra_Vector in parallel.
>
>Romain.
>
>
>On Nov 28, 2012, at 1:57 PM, Heroux, Michael A wrote:
>
>> Romain,
>> 
>> If I understand your situation correctly, you will want to write an
>> adapter for the pure virtual class Epetra_Operator, which is used by all
>> Trilinos linear solvers to apply the linear operator.  A reasonable
>> starting point for such a class is in
>> Trilinos/packages/AztecOO/src/AztecOO_Operator.[h|cpp].
>> 
>> Depending on the details of what you are doing you may need to reverse
>>the
>> roles of Apply() and ApplyInverse() from what AztecOO_Operator does. You
>> will implement Apply() or ApplyInverse() using the FFT library and you
>> will indicate that the other is not implemented.  AztecOO_Operator
>> implements ApplyInverse() and specifies that Apply() is not implemented.
>> In fact you should be able to use AztecOO_Operator::Apply() basically
>> as-is for one of your own methods.
>> 
>> I hope this helps.
>> 
>> Mike
>> 
>> On 11/28/12 2:46 PM, "Veltz Romain" <romain.veltz at inria.fr> wrote:
>> 
>>> Hello,
>>> 
>>> 
>>> I would like to interface a Fast Fourier Transform library with Epetra.
>>> More precisely, I am using NOX and LOCA to solve integral equations
>>>which
>>> involve the computations of Fourier Transform (in Matrix-Free
>>>formalism)
>>> and sparse Matrix-Vector products at the same time.
>>> 
>>> There is an old fftw code for serial 1d FFT in Thyra but it does not
>>>fit
>>> my needs. 
>>> 
>>> Could you give me some advice me please,
>>> 
>>> Thank you for your help.
>>> 
>>> Romain
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> Trilinos-Users mailing list
>>> Trilinos-Users at software.sandia.gov
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>>> 
>> 
>> 
>
>
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