petsc-3.7.7 2017-09-25
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VecScatterPetscToFFTW

 Copies the PETSc vector to the vector that goes into FFTW block.

Synopsis

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

Input Parameters

A - FFTW matrix
x - the PETSc vector

Output Parameters

y -the FFTW vector

Options Database Keys

-mat_fftw_plannerflags -set FFTW planner flags

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

VecScatterFFTWToPetsc()

Level:intermediate
Location:src/mat/impls/fft/fftw/fftw.c
Index of all Mat routines
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Index of all manual pages