gsl_fft_halfcomplex_float.h

该文件为c++的数学函数库!是一个非常有用的编程工具.它含有各种数学函数,为科学计算、工程应用等程序编写提供方便！

/* fft/gsl_fft_halfcomplex_float.h
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __GSL_FFT_HALFCOMPLEX_FLOAT_H__
#define __GSL_FFT_HALFCOMPLEX_FLOAT_H__

#include <stddef.h>

#include <gsl/gsl_math.h>
#include <gsl/gsl_complex.h>
#include <gsl/gsl_fft.h>
#include <gsl/gsl_fft_real_float.h>

#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif

__BEGIN_DECLS

int gsl_fft_halfcomplex_float_radix2_backward (float data[], const size_t stride, const size_t n);
int gsl_fft_halfcomplex_float_radix2_inverse (float data[], const size_t stride, const size_t n);
int gsl_fft_halfcomplex_float_radix2_transform (float data[], const size_t stride, const size_t n);

typedef struct
  {
    size_t n;
    size_t nf;
    size_t factor[64];
    gsl_complex_float *twiddle[64];
    gsl_complex_float *trig;
  }
gsl_fft_halfcomplex_wavetable_float;


gsl_fft_halfcomplex_wavetable_float * gsl_fft_halfcomplex_wavetable_float_alloc (size_t n);

void
gsl_fft_halfcomplex_wavetable_float_free (gsl_fft_halfcomplex_wavetable_float * wavetable);

int gsl_fft_halfcomplex_float_backward (float data[], const size_t stride, const size_t n,
                                        const gsl_fft_halfcomplex_wavetable_float * wavetable,
                                        gsl_fft_real_workspace_float * work);

int gsl_fft_halfcomplex_float_inverse (float data[], const size_t stride, const size_t n,
                                       const gsl_fft_halfcomplex_wavetable_float * wavetable,
                                       gsl_fft_real_workspace_float * work);

int gsl_fft_halfcomplex_float_transform (float data[], const size_t stride, const size_t n,
                                         const gsl_fft_halfcomplex_wavetable_float * wavetable,
                                         gsl_fft_real_workspace_float * work);

int
gsl_fft_halfcomplex_float_unpack (const float halfcomplex_coefficient[],
                                  float complex_coefficient[],
                                  const size_t stride, const size_t n);

int
gsl_fft_halfcomplex_float_radix2_unpack (const float halfcomplex_coefficient[],
                                         float complex_coefficient[],
                                         const size_t stride, const size_t n);

__END_DECLS

#endif /* __GSL_FFT_HALFCOMPLEX_FLOAT_H__ */