include/gsl/gsl_fft_real.h

0001 /* fft/gsl_fft_real.h
0002  *
0003  * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
0004  *
0005  * This program is free software; you can redistribute it and/or modify
0006  * it under the terms of the GNU General Public License as published by
0007  * the Free Software Foundation; either version 3 of the License, or (at
0008  * your option) any later version.
0009  *
0010  * This program is distributed in the hope that it will be useful, but
0011  * WITHOUT ANY WARRANTY; without even the implied warranty of
0012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
0013  * General Public License for more details.
0014  *
0015  * You should have received a copy of the GNU General Public License
0016  * along with this program; if not, write to the Free Software
0017  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
0018  */
0019
0020 #ifndef __GSL_FFT_REAL_H__
0021 #define __GSL_FFT_REAL_H__
0022
0023 #include <stddef.h>
0024
0025 #include <gsl/gsl_math.h>
0026 #include <gsl/gsl_complex.h>
0027 #include <gsl/gsl_fft.h>
0028
0029 #undef __BEGIN_DECLS
0030 #undef __END_DECLS
0031 #ifdef __cplusplus
0032 # define __BEGIN_DECLS extern "C" {
0033 # define __END_DECLS }
0034 #else
0035 # define __BEGIN_DECLS /* empty */
0036 # define __END_DECLS /* empty */
0037 #endif
0038
0039 __BEGIN_DECLS
0040
0041 int gsl_fft_real_radix2_transform (double data[], const size_t stride, const size_t n) ;
0042
0043 typedef struct
0044   {
0045     size_t n;
0046     size_t nf;
0047     size_t factor[64];
0048     gsl_complex *twiddle[64];
0049     gsl_complex *trig;
0050   }
0051 gsl_fft_real_wavetable;
0052
0053 typedef struct
0054   {
0055     size_t n;
0056     double *scratch;
0057   }
0058 gsl_fft_real_workspace;
0059
0060 gsl_fft_real_wavetable * gsl_fft_real_wavetable_alloc (size_t n);
0061
0062 void  gsl_fft_real_wavetable_free (gsl_fft_real_wavetable * wavetable);
0063
0064 gsl_fft_real_workspace * gsl_fft_real_workspace_alloc (size_t n);
0065
0066 void  gsl_fft_real_workspace_free (gsl_fft_real_workspace * workspace);
0067
0068
0069 int gsl_fft_real_transform (double data[], const size_t stride, const size_t n,
0070                             const gsl_fft_real_wavetable * wavetable,
0071                             gsl_fft_real_workspace * work);
0072
0073
0074 int gsl_fft_real_unpack (const double real_coefficient[],
0075                          double complex_coefficient[],
0076                          const size_t stride, const size_t n);
0077
0078 __END_DECLS
0079
0080 #endif /* __GSL_FFT_REAL_H__ */