petsc-3.9.4 2018-09-11

MatCreateSeqUSFFT

Creates a matrix object that provides sequential USFFT via the external package FFTW

#include "petscmat.h" 
#include "petscdmda.h"  
PetscErrorCode  MatCreateSeqUSFFT(Vec sampleCoords, DMDA freqDA, Mat *A)

Collective on MPI_Comm

	da	- geometry of the domain encoded by a DMDA
	A	- the matrix

intermediate

-mat_usfft_plannerflags

- set the FFTW planner flags