petsc-3.11.4 2019-09-28

MatCreateFFT

Creates a matrix object that provides FFT via an external package

#include "petscmat.h" 
PetscErrorCode MatCreateFFT(MPI_Comm comm,PetscInt ndim,const PetscInt dim[],MatType mattype,Mat *A)

Collective on MPI_Comm

	comm	- MPI communicator
	ndim	- the ndim-dimensional transform
	dim	- array of size ndim, dim[i] contains the vector length in the i-dimension
	type	- package type, e.g., FFTW or FFTCU

A -the matrix

intermediate

-mat_fft_type

- set FFT type