nnfftl_plan Struct Reference

data structure for an NNFFT (nonequispaced in time and frequency fast Fourier transform) plan with long double precision More...

#include <nfft3.h>

Data Fields
NFFT_INT	N_total
	Total number of Fourier coefficients.
NFFT_INT	M_total
	Total number of samples.
fftwl_complex *	f_hat
	Fourier coefficients.
fftwl_complex *	f
	Samples.
void(*	mv_trafo )(void *)
	Transform.
void(*	mv_adjoint )(void *)
	Adjoint transform.
int	d
	dimension, rank
long double *	sigma
	oversampling-factor
long double *	a
	1 + 2*m/N1
int *	N
	cut-off-frequencies
int *	N1
	sigma*N
int *	aN1
	sigma*a*N
int	m
	cut-off parameter in time-domain
long double *	b
	shape parameters
int	K
	number of precomp.
int	aN1_total
	aN1_total=aN1[0]* ... *aN1[d-1]
nfftl_plan *	direct_plan
	plan for the nfft
unsigned	nnfft_flags
	flags for precomputation, malloc
int *	n
	n=N1, for the window function
long double *	x
	nodes (in time/spatial domain)
long double *	v
	nodes (in fourier domain)
long double *	c_phi_inv
	precomputed data, matrix D
long double *	psi
	precomputed data, matrix B
int	size_psi
	only for thin B
int *	psi_index_g
	only for thin B
int *	psi_index_f
	only for thin B
fftwl_complex *	F
long double *	spline_coeffs
	input for de Boor algorithm, if B_SPLINE or SINC_2m is defined

Detailed Description

data structure for an NNFFT (nonequispaced in time and frequency fast Fourier transform) plan with long double precision

Definition at line 426 of file nfft3.h.

Field Documentation

N_total

NFFT_INT nnfftl_plan::N_total

Total number of Fourier coefficients.

Definition at line 426 of file nfft3.h.

M_total

NFFT_INT nnfftl_plan::M_total

Total number of samples.

Definition at line 426 of file nfft3.h.

f_hat

fftwl_complex* nnfftl_plan::f_hat

Fourier coefficients.

Definition at line 426 of file nfft3.h.

f

fftwl_complex* nnfftl_plan::f

Samples.

Definition at line 426 of file nfft3.h.

mv_trafo

void(* nnfftl_plan::mv_trafo) (void *)

Transform.

Definition at line 426 of file nfft3.h.

mv_adjoint

void(* nnfftl_plan::mv_adjoint) (void *)

Adjoint transform.

Definition at line 426 of file nfft3.h.

d

int nnfftl_plan::d

dimension, rank

Definition at line 426 of file nfft3.h.

sigma

long double* nnfftl_plan::sigma

oversampling-factor

Definition at line 426 of file nfft3.h.

a

long double* nnfftl_plan::a

1 + 2*m/N1

Definition at line 426 of file nfft3.h.

N

int* nnfftl_plan::N

cut-off-frequencies

Definition at line 426 of file nfft3.h.

N1

int* nnfftl_plan::N1

sigma*N

Definition at line 426 of file nfft3.h.

aN1

int* nnfftl_plan::aN1

sigma*a*N

Definition at line 426 of file nfft3.h.

m

int nnfftl_plan::m

cut-off parameter in time-domain

Definition at line 426 of file nfft3.h.

b

long double* nnfftl_plan::b

shape parameters

Definition at line 426 of file nfft3.h.

K

int nnfftl_plan::K

number of precomp.

uniform psi

Definition at line 426 of file nfft3.h.

aN1_total

int nnfftl_plan::aN1_total

aN1_total=aN1[0]* ... *aN1[d-1]

Definition at line 426 of file nfft3.h.

direct_plan

nfftl_plan* nnfftl_plan::direct_plan

plan for the nfft

Definition at line 426 of file nfft3.h.

nnfft_flags

unsigned nnfftl_plan::nnfft_flags

flags for precomputation, malloc

Definition at line 426 of file nfft3.h.

n

int* nnfftl_plan::n

n=N1, for the window function

Definition at line 426 of file nfft3.h.

x

long double* nnfftl_plan::x

nodes (in time/spatial domain)

Definition at line 426 of file nfft3.h.

v

long double* nnfftl_plan::v

nodes (in fourier domain)

Definition at line 426 of file nfft3.h.

c_phi_inv

long double* nnfftl_plan::c_phi_inv

precomputed data, matrix D

Definition at line 426 of file nfft3.h.

psi

long double* nnfftl_plan::psi

precomputed data, matrix B

Definition at line 426 of file nfft3.h.

size_psi

int nnfftl_plan::size_psi

only for thin B

Definition at line 426 of file nfft3.h.

psi_index_g

int* nnfftl_plan::psi_index_g

only for thin B

Definition at line 426 of file nfft3.h.

psi_index_f

int* nnfftl_plan::psi_index_f

only for thin B

Definition at line 426 of file nfft3.h.

F

fftwl_complex* nnfftl_plan::F

Definition at line 426 of file nfft3.h.

spline_coeffs

long double* nnfftl_plan::spline_coeffs

input for de Boor algorithm, if B_SPLINE or SINC_2m is defined

Definition at line 426 of file nfft3.h.

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The documentation for this struct was generated from the following file:

• nfft3.h