/usr/include/madness/misc/cfft.h is in libmadness-dev 0.10.1~gite4aa500e-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | // fft.h - declaration of class
// of fast Fourier transform - FFT
//
// The code is property of LIBROW
// You can use it on your own
// When utilizing credit LIBROW site
#ifndef MADNESS_MISC_CFFT_H__INCLUDED
#define MADNESS_MISC_CFFT_H__INCLUDED
// Include complex numbers header
#include <complex>
typedef std::complex<double> double_complex;
class CFFT
{
public:
// FORWARD FOURIER TRANSFORM
// Input - input data
// Output - transform result
// N - length of both input data and result
static bool Forward(const double_complex *const Input, double_complex *const Output, const unsigned int N);
// FORWARD FOURIER TRANSFORM, INPLACE VERSION
// Data - both input data and output
// N - length of input data
static bool Forward(double_complex *const Data, const unsigned int N);
// INVERSE FOURIER TRANSFORM
// Input - input data
// Output - transform result
// N - length of both input data and result
// Scale - if to scale result
static bool Inverse(const double_complex *const Input, double_complex *const Output, const unsigned int N, const bool Scale = true);
// INVERSE FOURIER TRANSFORM, INPLACE VERSION
// Data - both input data and output
// N - length of both input data and result
// Scale - if to scale result
static bool Inverse(double_complex *const Data, const unsigned int N, const bool Scale = true);
protected:
// Rearrange function and its inplace version
static void Rearrange(const double_complex *const Input, double_complex *const Output, const unsigned int N);
static void Rearrange(double_complex *const Data, const unsigned int N);
// FFT implementation
static void Perform(double_complex *const Data, const unsigned int N, const bool Inverse = false);
// Scaling of inverse FFT result
static void Scale(double_complex *const Data, const unsigned int N);
};
#endif // MADNESS_MISC_CFFT_H__INCLUDED
|