gsl_sf_clausen.h

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/* specfunc/gsl_sf_clausen.h
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Author:  G. Jungman */

#ifndef __GSL_SF_CLAUSEN_H__
#define __GSL_SF_CLAUSEN_H__

#include <gsl/gsl_sf_result.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


/* Calculate the Clausen integral:
 *   Cl_2(x) := Integrate[-Log[2 Sin[t/2]], {t,0,x}]
 *
 * Relation to dilogarithm:
 *   Cl_2(theta) = Im[ Li_2(e^(i theta)) ]
 */
int gsl_sf_clausen_e(double x, gsl_sf_result * result);
double gsl_sf_clausen(const double x);


__END_DECLS

#endif /* __GSL_SF_CLAUSEN_H__ */