petsc-3.8.4 2018-03-24
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Copies the PETSc vector to the vector that goes into FFTW block.


#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


Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages