PETSc version 3.15.5
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# MatCreateSeqUSFFT

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

### Synopsis

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

Collective

### Input Parameter

| da | - geometry of the domain encoded by a DMDA

### Output Parameter

| A | - the matrix

### Options Database Keys

| -mat_usfft_plannerflags | - set the FFTW planner flags

### Level

intermediate

### Location

src/dm/impls/da/usfft/matusfft.c
Index of all DMDA routines
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Index of all manual pages