VecScatterPetscToFFTW#

Copies a PETSc vector to the vector that goes into MATFFTW calls.

Synopsis#

#include "petscmat.h" 
#include "petscvec.h"   
PetscErrorCode VecScatterPetscToFFTW(Mat A, Vec x, Vec y)

Collective

Input Parameters#

  • A - FFTW matrix

  • x - the PETSc vector

Output Parameter#

  • y - the FFTW vector

Note#

For real parallel FFT, FFTW requires insertion of extra space at the end of last dimension. This required even when one is not doing in-place transform. The last dimension size must be changed to 2*(dim[last]/2+1) to accommodate these extra zeros. This routine does that job by scattering operation.

See Also#

Matrices, Mat, MATFFTW, VecScatterFFTWToPetsc(), MatCreateVecsFFTW()

Level#

intermediate

Location#

src/mat/impls/fft/fftw/fftw.c

Implementations#

VecScatterPetscToFFTW_FFTW in src/mat/impls/fft/fftw/fftw.c

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