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/* fft/gsl_fft_halfcomplex.h
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __GSL_FFT_HALFCOMPLEX_H__
#define __GSL_FFT_HALFCOMPLEX_H__
#include <stddef.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_complex.h>
#include <gsl/gsl_fft.h>
#include <gsl/gsl_fft_real.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_radix2_backward (double data[], const size_t stride, const size_t n);
int gsl_fft_halfcomplex_radix2_inverse (double data[], const size_t stride, const size_t n);
int gsl_fft_halfcomplex_radix2_transform (double data[], const size_t stride, const size_t n);
typedef struct
{
size_t n;
size_t nf;
size_t factor[64];
gsl_complex *twiddle[64];
gsl_complex *trig;
}
gsl_fft_halfcomplex_wavetable;
gsl_fft_halfcomplex_wavetable * gsl_fft_halfcomplex_wavetable_alloc (size_t n);
void
gsl_fft_halfcomplex_wavetable_free (gsl_fft_halfcomplex_wavetable * wavetable);
int gsl_fft_halfcomplex_backward (double data[], const size_t stride, const size_t n,
const gsl_fft_halfcomplex_wavetable * wavetable,
gsl_fft_real_workspace * work);
int gsl_fft_halfcomplex_inverse (double data[], const size_t stride, const size_t n,
const gsl_fft_halfcomplex_wavetable * wavetable,
gsl_fft_real_workspace * work);
int gsl_fft_halfcomplex_transform (double data[], const size_t stride, const size_t n,
const gsl_fft_halfcomplex_wavetable * wavetable,
gsl_fft_real_workspace * work);
int
gsl_fft_halfcomplex_unpack (const double halfcomplex_coefficient[],
double complex_coefficient[],
const size_t stride, const size_t n);
int
gsl_fft_halfcomplex_radix2_unpack (const double halfcomplex_coefficient[],
double complex_coefficient[],
const size_t stride, const size_t n);
__END_DECLS
#endif /* __GSL_FFT_HALFCOMPLEX_H__ */
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