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/*
* This file is part of libc_utils.
*
* libc_utils 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.
*
* libc_utils 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 libc_utils; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* libc_utils is being developed at the Max-Planck-Institut fuer Astrophysik
* and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
* (DLR).
*/
/*! \file trig_utils.h
*
* Copyright (C) 2016-2017 Max-Planck-Society
* \author Martin Reinecke
*/
#ifndef PLANCK_TRIGHELPER_H
#define PLANCK_TRIGHELPER_H
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
/*! Computes sin/cos(2*pi*m/n). Adapted from FFTW. */
void fracsincos(int m, int n, double *s, double *c);
/*! Computes sine and cosine of \a i*alpha for \a i=[0;n[. Stores the sines
in \a s[i*stride] and the cosines in c[i*stride]. */
void sincos_multi (size_t n, double alpha, double *s, double *c, int stride);
/*! Computes sine and cosine of \a i*2*pi*num/den for \a i=[0;n[.
Stores the sines in \a s[i*stride] and the cosines in c[i*stride]. */
void fracsincos_multi (size_t n, int num, int den, double *s, double *c,
int stride);
/*! Computes sine and cosine of \a i*2pi/n for \a i=[0;nang[. Stores the sines
in \a s[i*stride] and the cosines in c[i*stride]. */
void sincos_2pibyn (size_t n, size_t nang, double *s, double *c, int stride);
typedef struct triggen
{
size_t n, ilg, mask;
double *t1, *t2;
} triggen;
void triggen_init (struct triggen *tg, size_t n);
void triggen_get (const struct triggen *tg,size_t i, double *s, double *c);
void triggen_destroy (struct triggen *tg);
#ifdef __cplusplus
}
#endif
#endif
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