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 | |
37 | typedef enum |
38 | { |
39 | gsl_fft_forward = -1, gsl_fft_backward = +1 |
40 | } |
41 | gsl_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 | |