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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 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.
- */
- /* Author: G. Jungman */
- #ifndef __GSL_SF_CLAUSEN_H__
- #define __GSL_SF_CLAUSEN_H__
- #include "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__ */
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