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

Examples

src/snes/tutorials/ex7.c

Implementations

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

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