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- /* fft/gsl_fft_complex.h
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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 3 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_COMPLEX_H__
- #define __GSL_FFT_COMPLEX_H__
- #include <stddef.h>
- #include "gsl_math.h"
- #include "gsl_complex.h"
- #include "gsl_fft.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
- /* Power of 2 routines */
- int gsl_fft_complex_radix2_forward (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n);
- int gsl_fft_complex_radix2_backward (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n);
- int gsl_fft_complex_radix2_inverse (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n);
- int gsl_fft_complex_radix2_transform (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n,
- const gsl_fft_direction sign);
- int gsl_fft_complex_radix2_dif_forward (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n);
- int gsl_fft_complex_radix2_dif_backward (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n);
- int gsl_fft_complex_radix2_dif_inverse (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n);
- int gsl_fft_complex_radix2_dif_transform (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n,
- const gsl_fft_direction sign);
- /* Mixed Radix general-N routines */
- typedef struct
- {
- size_t n;
- size_t nf;
- size_t factor[64];
- gsl_complex *twiddle[64];
- gsl_complex *trig;
- }
- gsl_fft_complex_wavetable;
- typedef struct
- {
- size_t n;
- double *scratch;
- }
- gsl_fft_complex_workspace;
- gsl_fft_complex_wavetable *gsl_fft_complex_wavetable_alloc (size_t n);
- void gsl_fft_complex_wavetable_free (gsl_fft_complex_wavetable * wavetable);
- gsl_fft_complex_workspace *gsl_fft_complex_workspace_alloc (size_t n);
- void gsl_fft_complex_workspace_free (gsl_fft_complex_workspace * workspace);
- int gsl_fft_complex_memcpy (gsl_fft_complex_wavetable * dest,
- gsl_fft_complex_wavetable * src);
- int gsl_fft_complex_forward (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n,
- const gsl_fft_complex_wavetable * wavetable,
- gsl_fft_complex_workspace * work);
- int gsl_fft_complex_backward (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n,
- const gsl_fft_complex_wavetable * wavetable,
- gsl_fft_complex_workspace * work);
- int gsl_fft_complex_inverse (gsl_complex_packed_array data,
- const size_t stride,
- const size_t n,
- const gsl_fft_complex_wavetable * wavetable,
- gsl_fft_complex_workspace * work);
- int gsl_fft_complex_transform (gsl_complex_packed_array data,
- const size_t stride, const size_t n,
- const gsl_fft_complex_wavetable * wavetable,
- gsl_fft_complex_workspace * work,
- const gsl_fft_direction sign);
- __END_DECLS
- #endif /* __GSL_FFT_COMPLEX_H__ */
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