fftR2C

Real to Complex Fast Fourier Transform. More...

Functions
template<int rank>
array	fftR2C (const array &in, const dim4 &dims, const double norm_factor=1.0)
	C++ Interface for real to complex fast fourier transform for one dimensional signals.
template<int rank>
array	fftR2C (const array &in, const double norm_factor=1.0)
	C++ Interface for real to complex fast fourier transform for one dimensional signals.
AFAPI af_err	af_fft_r2c (af_array *out, const af_array in, const double norm_factor, const dim_t pad0)
	C Interface for real to complex fast fourier transform for one dimensional signals.
AFAPI af_err	af_fft2_r2c (af_array *out, const af_array in, const double norm_factor, const dim_t pad0, const dim_t pad1)
	C Interface for real to complex fast fourier transform for two dimensional signals.
AFAPI af_err	af_fft3_r2c (af_array *out, const af_array in, const double norm_factor, const dim_t pad0, const dim_t pad1, const dim_t pad2)
	C Interface for real to complex fast fourier transform for three dimensional signals.

Detailed Description

Real to Complex Fast Fourier Transform.

Function Documentation

af_fft2_r2c()

AFAPI af_err af_fft2_r2c	(	af_array *	out,
		const af_array	in,
		const double	norm_factor,
		const dim_t	pad0,
		const dim_t	pad1 )

C Interface for real to complex fast fourier transform for two dimensional signals.

Parameters

[out]	out	is a complex array containing the non redundant parts of in.
[in]	in	is a real array
[in]	norm_factor	is the normalization factor with which the input is scaled after the transformation is applied
[in]	pad0	is the length of output signals along first dimension - used to either truncate/pad the input
[in]	pad1	is the length of output signals along second dimension - used to either truncate/pad the input

Returns

AF_SUCCESS if the fft transform is successful, otherwise an appropriate error code is returned.

Note

The first dimension of the output will be of size (pad0 / 2) + 1. The second dimension of the output will be pad1. The remaining dimensions are unchanged.

af_fft3_r2c()

AFAPI af_err af_fft3_r2c	(	af_array *	out,
		const af_array	in,
		const double	norm_factor,
		const dim_t	pad0,
		const dim_t	pad1,
		const dim_t	pad2 )

C Interface for real to complex fast fourier transform for three dimensional signals.

Parameters

[out]	out	is a complex array containing the non redundant parts of in.
[in]	in	is a real array
[in]	norm_factor	is the normalization factor with which the input is scaled after the transformation is applied
[in]	pad0	is the length of output signals along first dimension - used to either truncate/pad the input
[in]	pad1	is the length of output signals along second dimension - used to either truncate/pad the input
[in]	pad2	is the length of output signals along third dimension - used to either truncate/pad the input

Returns

AF_SUCCESS if the fft transform is successful, otherwise an appropriate error code is returned.

Note

The first dimension of the output will be of size (pad0 / 2) + 1. The second dimension of the output will be pad1. The third dimension of the output will be pad 2.

af_fft_r2c()

AFAPI af_err af_fft_r2c	(	af_array *	out,
		const af_array	in,
		const double	norm_factor,
		const dim_t	pad0 )

C Interface for real to complex fast fourier transform for one dimensional signals.

Parameters

[out]	out	is a complex array containing the non redundant parts of in.
[in]	in	is a real array
[in]	norm_factor	is the normalization factor with which the input is scaled after the transformation is applied
[in]	pad0	is the length of output signals along first dimension - used to either truncate/pad the input

Returns

AF_SUCCESS if the fft transform is successful, otherwise an appropriate error code is returned.

Note

The first dimension of the output will be of size (pad0 / 2) + 1. The remaining dimensions are unchanged.

fftR2C() [1/2]

template<int rank>

array fftR2C	(	const array &	in,
		const dim4 &	dims,
		const double	norm_factor = 1.0 )

C++ Interface for real to complex fast fourier transform for one dimensional signals.

Parameters

[in]	in	is a real array
[in]	dims	is the requested padded dimensions before the transform is applied
[in]	norm_factor	is the normalization factor with which the input is scaled after the transformation is applied

Returns

a complex array containing the non redundant parts of in along the first dimension.

Note

The first dimension of the output will be of size (dims[0] / 2) + 1. The remaining dimensions are unchanged.

fftR2C() [2/2]

template<int rank>

array fftR2C	(	const array &	in,
		const double	norm_factor = 1.0 )

C++ Interface for real to complex fast fourier transform for one dimensional signals.

Parameters

[in]	in	is a real array
[in]	norm_factor	is the normalization factor with which the input is scaled after the transformation is applied

Returns

a complex array containing the non redundant parts of in along the first dimension.

Note

The first dimension of the output will be of size (in.dims(0) / 2) + 1. The remaining dimensions are unchanged.