mod_fft Module Reference

Self-contained complex FFT utilities based on the mixed-radix Singleton transform historically embedded in mod_pfss. More...

Functions/Subroutines
logical function, public	fft_size_supported (n)
	Return whether the legacy mixed-radix workspace can handle a transform.
integer function, public	fft_next_supported (n)
character(len=128) function, public	fft_factorization (n)
	Human-readable prime factorization used in unsupported-size diagnostics.
subroutine, public	fft_1d (data, inverse)
	In-place complex one-dimensional FFT. The inverse is normalized.
subroutine, public	fft_2d (data, inverse)
	In-place complex two-dimensional FFT. The inverse is normalized.
subroutine, public	fft_2d_real_imag (ar, ai, inverse)
	In-place two-dimensional FFT on split real/imaginary storage. This avoids allocation and copying in repeated plane transforms.
subroutine, public	fft_raw (a, b, ntot, n, nspan, isn)

Detailed Description

Self-contained complex FFT utilities based on the mixed-radix Singleton transform historically embedded in mod_pfss.

Function/Subroutine Documentation

fft_1d()

subroutine, public mod_fft::fft_1d	(	double complex, dimension(:), intent(inout)	data,
		logical, intent(in)	inverse
	)

In-place complex one-dimensional FFT. The inverse is normalized.

Definition at line 128 of file mod_fft.t.

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fft_2d()

subroutine, public mod_fft::fft_2d	(	double complex, dimension(:,:), intent(inout)	data,
		logical, intent(in)	inverse
	)

In-place complex two-dimensional FFT. The inverse is normalized.

Definition at line 151 of file mod_fft.t.

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fft_2d_real_imag()

subroutine, public mod_fft::fft_2d_real_imag	(	double precision, dimension(:,:), intent(inout)	ar,
		double precision, dimension(:,:), intent(inout)	ai,
		logical, intent(in)	inverse
	)

In-place two-dimensional FFT on split real/imaginary storage. This avoids allocation and copying in repeated plane transforms.

Definition at line 180 of file mod_fft.t.

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fft_factorization()

character(len=128) function, public mod_fft::fft_factorization

(

integer, intent(in)

n

)

Human-readable prime factorization used in unsupported-size diagnostics.

Definition at line 82 of file mod_fft.t.

fft_next_supported()

integer function, public mod_fft::fft_next_supported

(

integer, intent(in)

n

)

Definition at line 72 of file mod_fft.t.

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fft_raw()

subroutine, public mod_fft::fft_raw	(	double precision, dimension(*)	a,
		double precision, dimension(*)	b,
		integer	ntot,
		integer	n,
		integer	nspan,
		integer	isn
	)

Definition at line 205 of file mod_fft.t.

fft_size_supported()

logical function, public mod_fft::fft_size_supported

(

integer, intent(in)

n

)

Return whether the legacy mixed-radix workspace can handle a transform.

Definition at line 18 of file mod_fft.t.

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