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/* fft/gsl_fft.h
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __GSL_FFT_H__
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#define __GSL_FFT_H__
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#include <gsl/gsl_complex.h>
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#undef __BEGIN_DECLS
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#undef __END_DECLS
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#ifdef __cplusplus
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# define __BEGIN_DECLS extern "C" {
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# define __END_DECLS }
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#else
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# define __BEGIN_DECLS /* empty */
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# define __END_DECLS /* empty */
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#endif
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__BEGIN_DECLS
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typedef enum
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{
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gsl_fft_forward = -1, gsl_fft_backward = +1
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}
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gsl_fft_direction;
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/* this gives the sign in the formula
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h(f) = \sum x(t) exp(+/- 2 pi i f t)
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where - is the forward transform direction and + the inverse direction */
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__END_DECLS
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#endif /* __GSL_FFT_H__ */
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