Non-equispaced FFTs through the C interface of the FINUFFT library. More...

Detailed Description

Non-equispaced FFTs through the C interface of the FINUFFT library.

Data Types
type	finufft_t

Functions/Subroutines
subroutine, public	finufft_read_options (finufft, namespace)

subroutine, public	finufft_init (finufft, finufft_options, N, dim, M)

subroutine, public	finufft_precompute (finufft, X1, X2, X3)
	Hand the spatial nodes to FINUFFT. More...

subroutine	finufft_scale_nodes (X, v, inv_spacing)
	Map the nodes onto [-1/2, 1/2) and return the reciprocal of the smallest scaled spacing. More...

subroutine, public	finufft_write_info (finufft)

subroutine, public	finufft_end (finufft)

subroutine, public	dfinufft_forward (finufft, in, out)
	Evaluate the Fourier modes on the non-equispaced nodes. More...

subroutine, public	dfinufft_backward (finufft, in, out)
	Project the non-equispaced nodes back onto the Fourier modes. More...

subroutine, public	zfinufft_forward (finufft, in, out)
	Evaluate the Fourier modes on the non-equispaced nodes. More...

subroutine, public	zfinufft_backward (finufft, in, out)
	Project the non-equispaced nodes back onto the Fourier modes. More...

Function/Subroutine Documentation

◆ finufft_read_options()

subroutine, public finufft_oct_m::finufft_read_options	(	type(finufft_t), intent(inout)	finufft,
		type(namespace_t), intent(in)	namespace
	)

Definition at line 165 of file finufft.F90.

◆ finufft_init()

subroutine, public finufft_oct_m::finufft_init	(	type(finufft_t), intent(inout)	finufft,
		type(finufft_t), intent(in)	finufft_options,
		integer, dimension(3), intent(in)	N,
		integer, intent(in)	dim,
		integer, dimension(3), intent(in)	M
	)

Parameters

[in]	n	number of Fourier modes
[in]	dim	number of spatial dimensions
[in]	m	number of spatial nodes

Definition at line 189 of file finufft.F90.

◆ finufft_precompute()

subroutine, public finufft_oct_m::finufft_precompute	(	type(finufft_t), intent(inout)	finufft,
		real(real64), dimension(:), intent(in)	X1,
		real(real64), dimension(:), intent(in), optional	X2,
		real(real64), dimension(:), intent(in), optional	X3
	)

Hand the spatial nodes to FINUFFT.

Takes the 1D coordinate vectors defining each axis, X1 for x, X2 for y and X3 for z, and expands them into the Cartesian grid of nodes that FINUFFT expects as a flat list, indexed in Fortran order.

Definition at line 226 of file finufft.F90.

◆ finufft_scale_nodes()

subroutine finufft_oct_m::finufft_scale_nodes	(	real(real64), dimension(:), intent(in)	X,
		real(real64), dimension(:), intent(out)	v,
		real(real64), intent(out)	inv_spacing
	)

private

Map the nodes onto [-1/2, 1/2) and return the reciprocal of the smallest scaled spacing.

Definition at line 304 of file finufft.F90.

◆ finufft_write_info()

subroutine, public finufft_oct_m::finufft_write_info ( type(finufft_t), intent(in) finufft )

Definition at line 330 of file finufft.F90.

◆ finufft_end()

subroutine, public finufft_oct_m::finufft_end ( type(finufft_t), intent(inout) finufft )

Definition at line 364 of file finufft.F90.

◆ dfinufft_forward()

subroutine, public finufft_oct_m::dfinufft_forward	(	type(finufft_t), intent(in)	finufft,
		real(real64), dimension(:,:,:), intent(in)	in,
		complex(real64), dimension(:,:,:), intent(out)	out
	)

Evaluate the Fourier modes on the non-equispaced nodes.

Definition at line 451 of file finufft.F90.

◆ dfinufft_backward()

subroutine, public finufft_oct_m::dfinufft_backward	(	type(finufft_t), intent(in)	finufft,
		complex(real64), dimension (:,:,:), intent(in)	in,
		real(real64), dimension(:,:,:), intent(out)	out
	)

Project the non-equispaced nodes back onto the Fourier modes.

Definition at line 470 of file finufft.F90.

◆ zfinufft_forward()

subroutine, public finufft_oct_m::zfinufft_forward	(	type(finufft_t), intent(in)	finufft,
		complex(real64), dimension(:,:,:), intent(in)	in,
		complex(real64), dimension(:,:,:), intent(out)	out
	)