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#
Implementations#
VecScatterPetscToFFTW_FFTW() in src/mat/impls/fft/fftw/fftw.c
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Index of all manual pages