Actual source code: fft.c

petsc-3.8.3 2017-12-09
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  2: /*
  3:     Provides an interface to the FFT packages.
  4: */

  6:  #include <../src/mat/impls/fft/fft.h>

  8: PetscErrorCode MatDestroy_FFT(Mat A)
  9: {
 11:   Mat_FFT        *fft = (Mat_FFT*)A->data;

 14:   if (fft->matdestroy) {
 15:     (fft->matdestroy)(A);
 16:   }
 17:   PetscFree(fft->dim);
 18:   PetscFree(A->data);
 19:   PetscObjectChangeTypeName((PetscObject)A,0);
 20:   return(0);
 21: }

 23: /*@C
 24:       MatCreateFFT - Creates a matrix object that provides FFT via an external package

 26:    Collective on MPI_Comm

 28:    Input Parameter:
 29: +   comm - MPI communicator
 30: .   ndim - the ndim-dimensional transform
 31: .   dim - array of size ndim, dim[i] contains the vector length in the i-dimension
 32: -   type - package type, e.g., FFTW or FFTCU

 34:    Output Parameter:
 35: .   A  - the matrix

 37:   Options Database Keys:
 38: + -mat_fft_type - set FFT type

 40:    Level: intermediate

 42: @*/
 43: PetscErrorCode MatCreateFFT(MPI_Comm comm,PetscInt ndim,const PetscInt dim[],MatType mattype,Mat *A)
 44: {
 46:   PetscMPIInt    size;
 47:   Mat            FFT;
 48:   PetscInt       N,i;
 49:   Mat_FFT        *fft;

 52:   if (ndim < 1) SETERRQ1(comm,PETSC_ERR_USER,"ndim %d must be > 0",ndim);
 53:   MPI_Comm_size(comm, &size);

 55:   MatCreate(comm,&FFT);
 56:   PetscNewLog(FFT,&fft);
 57:   FFT->data = (void*)fft;
 58:   N         = 1;
 59:   for (i=0; i<ndim; i++) {
 60:     if (dim[i] < 1) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_USER,"dim[%d]=%d must be > 0",i,dim[i]);
 61:     N *= dim[i];
 62:   }

 64:   PetscMalloc1(ndim,&fft->dim);
 65:   PetscMemcpy(fft->dim,dim,ndim*sizeof(PetscInt));

 67:   fft->ndim = ndim;
 68:   fft->n    = PETSC_DECIDE;
 69:   fft->N    = N;
 70:   fft->data = NULL;

 72:   MatSetType(FFT,mattype);

 74:   FFT->ops->destroy = MatDestroy_FFT;

 76:   /* get runtime options */
 77:   PetscOptionsBegin(PetscObjectComm((PetscObject)FFT),((PetscObject)FFT)->prefix,"FFT Options","Mat");
 78:   PetscOptionsEnd();

 80:   *A = FFT;
 81:   return(0);
 82: }