| /* 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., 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/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__ */ |
