petsc-3.13.6 2020-09-29

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.

Level

intermediate

Location

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

Implementations

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

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