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_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 #ifndef GSL_DISABLE_DEPRECATED 38 typedef enum 39 { 40 forward = -1, backward = +1, 41 gsl_fft_forward = -1, gsl_fft_backward = +1 42 } 43 gsl_fft_direction; 44 #else 45 typedef enum 46 { 47 gsl_fft_forward = -1, gsl_fft_backward = +1 48 } 49 gsl_fft_direction; 50 #endif 51 52 /* this gives the sign in the formula 53 54 h(f) = \sum x(t) exp(+/- 2 pi i f t) 55 56 where - is the forward transform direction and + the inverse direction */ 57 58 __END_DECLS 59 60 #endif /* __GSL_FFT_H__ */ 61