Date: 2021-03-03T22:26:23+00:00

Actual source code: fft.c
petsc-3.14.5 2021-03-03
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      1: /*
      2:     Provides an interface to the FFT packages.
      3: */

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

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

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

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

     25:    Collective

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

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

     36:    Options Database Keys:
     37: .   -mat_fft_type - set FFT type fft or seqcufft

     39:    Note: this serves as a base class for all FFT marix classes, currently MATFFTW or MATSEQCUFFT

     41:    Level: intermediate

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

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

     57:   MatCreate(comm,&FFT);
     58:   PetscNewLog(FFT,&fft);
     59:   FFT->data = (void*)fft;
     60:   N         = 1;
     61:   for (i=0; i<ndim; i++) {
     62:     if (dim[i] < 1) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_USER,"dim[%d]=%d must be > 0",i,dim[i]);
     63:     N *= dim[i];
     64:   }

     66:   PetscMalloc1(ndim,&fft->dim);
     67:   PetscArraycpy(fft->dim,dim,ndim);

     69:   fft->ndim = ndim;
     70:   fft->n    = PETSC_DECIDE;
     71:   fft->N    = N;
     72:   fft->data = NULL;

     74:   MatSetType(FFT,mattype);

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

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

     82:   *A = FFT;
     83:   return(0);
     84: }