1/* fft/gsl_fft.h
2 *
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19
20#ifndef __GSL_FFT_H__
21#define __GSL_FFT_H__
22
23#include <gsl/gsl_complex.h>
24
25#undef __BEGIN_DECLS
26#undef __END_DECLS
27#ifdef __cplusplus
28# define __BEGIN_DECLS extern "C" {
29# define __END_DECLS }
30#else
31# define __BEGIN_DECLS /* empty */
32# define __END_DECLS /* empty */
33#endif
34
35__BEGIN_DECLS
36
37typedef enum
38 {
39 gsl_fft_forward = -1, gsl_fft_backward = +1
40 }
41gsl_fft_direction;
42
43/* this gives the sign in the formula
44
45 h(f) = \sum x(t) exp(+/- 2 pi i f t)
46
47 where - is the forward transform direction and + the inverse direction */
48
49__END_DECLS
50
51#endif /* __GSL_FFT_H__ */
52