Complex to Real Fast Fourier Transform. More...

## Functions

template<int rank>
array fftC2R (const array &in, bool is_odd=false, const double norm_factor=1.0)
C++ Interface for complex to real fast fourier transform. More...

AFAPI af_err af_fft_c2r (af_array *out, const af_array in, const double norm_factor, const bool is_odd)
C Interface for complex to real fast fourier transform for one dimensional signals. More...

AFAPI af_err af_fft2_c2r (af_array *out, const af_array in, const double norm_factor, const bool is_odd)
C Interface for complex to real fast fourier transform for two dimensional signals. More...

AFAPI af_err af_fft3_c2r (af_array *out, const af_array in, const double norm_factor, const bool is_odd)
C Interface for complex to real fast fourier transform for three dimensional signals. More...

## Detailed Description

Complex to Real Fast Fourier Transform.

## ◆ af_fft2_c2r()

 AFAPI af_err af_fft2_c2r ( af_array * out, const af_array in, const double norm_factor, const bool is_odd )

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

Parameters
 [out] out is a real array containing the output of the transform. [in] in is a complex array containing only the non redundant parts of the signals. [in] norm_factor is the normalization factor with which the input is scaled after the transformation is applied [in] is_odd is a flag signifying if the output should be even or odd size
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 2 * dim0 - 1 if is_odd is true else 2 * dim0 - 2 where dim0 is the first dimension of the input. The remaining dimensions are unchanged.

## ◆ af_fft3_c2r()

 AFAPI af_err af_fft3_c2r ( af_array * out, const af_array in, const double norm_factor, const bool is_odd )

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

Parameters
 [out] out is a real array containing the output of the transform. [in] in is a complex array containing only the non redundant parts of the signals. [in] norm_factor is the normalization factor with which the input is scaled after the transformation is applied [in] is_odd is a flag signifying if the output should be even or odd size
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 2 * dim0 - 1 if is_odd is true else 2 * dim0 - 2 where dim0 is the first dimension of the input. The remaining dimensions are unchanged.

## ◆ af_fft_c2r()

 AFAPI af_err af_fft_c2r ( af_array * out, const af_array in, const double norm_factor, const bool is_odd )

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

Parameters
 [out] out is a real array containing the output of the transform. [in] in is a complex array containing only the non redundant parts of the signals. [in] norm_factor is the normalization factor with which the input is scaled after the transformation is applied [in] is_odd is a flag signifying if the output should be even or odd size
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 2 * dim0 - 1 if is_odd is true else 2 * dim0 - 2 where dim0 is the first dimension of the input. The remaining dimensions are unchanged.

## ◆ fftC2R()

 array af::fftC2R ( const array & in, bool is_odd = false, const double norm_factor = 1.0 )

C++ Interface for complex to real fast fourier transform.

Parameters
 [in] in is a complex array containing only the non redundant parts of the signals [in] is_odd is a flag signifying if the output should be even or odd size [in] norm_factor is the normalization factor with which the input is scaled after the transformation is applied
Template Parameters
 rank signifies the dimensionality of the transform
Returns
A real array of size [2 * idim0 - 2 + is_odd, idim1, idim2, idim3] where idim{0,1,2,3} signify input dimensions