| /* fft/gsl_fft_halfcomplex.h |
| * |
| * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 2 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__ */ |