/* specfunc/gsl_sf_coupling.h
 * 
 * Copyright (C) 1996,1997,1998,1999,2000,2001,2002 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_COUPLING_H__
#define __GSL_SF_COUPLING_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


/* 3j Symbols:  / ja jb jc \
 *              \ ma mb mc /
 *
 * exceptions: GSL_EDOM, GSL_EOVRFLW
 */
int gsl_sf_coupling_3j_e(int two_ja, int two_jb, int two_jc,
                            int two_ma, int two_mb, int two_mc,
                            gsl_sf_result * result
                            );
double gsl_sf_coupling_3j(int two_ja, int two_jb, int two_jc,
                          int two_ma, int two_mb, int two_mc
                          );


/* 6j Symbols:  / ja jb jc \
 *              \ jd je jf /
 *
 * exceptions: GSL_EDOM, GSL_EOVRFLW
 */
int gsl_sf_coupling_6j_e(int two_ja, int two_jb, int two_jc,
                         int two_jd, int two_je, int two_jf,
                         gsl_sf_result * result
                         );
double gsl_sf_coupling_6j(int two_ja, int two_jb, int two_jc,
                          int two_jd, int two_je, int two_jf
                          );

/* Racah W coefficients:
 *
 *   W(a b c d; e f) = (-1)^{a+b+c+d} / a b e \
 *                                    \ d c f /
 *
 * exceptions: GSL_EDOM, GSL_EOVRFLW
 */
int gsl_sf_coupling_RacahW_e(int two_ja, int two_jb, int two_jc,
                             int two_jd, int two_je, int two_jf,
                             gsl_sf_result * result
                             );
double gsl_sf_coupling_RacahW(int two_ja, int two_jb, int two_jc,
                              int two_jd, int two_je, int two_jf
                              );


/* 9j Symbols:  / ja jb jc \
 *              | jd je jf |
 *              \ jg jh ji /
 *
 * exceptions: GSL_EDOM, GSL_EOVRFLW
 */
int gsl_sf_coupling_9j_e(int two_ja, int two_jb, int two_jc,
                         int two_jd, int two_je, int two_jf,
                         int two_jg, int two_jh, int two_ji,
                         gsl_sf_result * result
                         );
double gsl_sf_coupling_9j(int two_ja, int two_jb, int two_jc,
                          int two_jd, int two_je, int two_jf,
                          int two_jg, int two_jh, int two_ji
                          );


/* INCORRECT version of 6j Symbols:
 * This function actually calculates
 *              / ja jb je \
 *              \ jd jc jf /
 * It represents the original implementation,
 * which had the above permutation of the
 * arguments. This was wrong and confusing,
 * and I had to fix it. Sorry for the trouble.
 * [GJ] Tue Nov 26 12:53:39 MST 2002
 *
 * exceptions: GSL_EDOM, GSL_EOVRFLW
 */
#ifndef GSL_DISABLE_DEPRECATED
int gsl_sf_coupling_6j_INCORRECT_e(int two_ja, int two_jb, int two_jc,
                                   int two_jd, int two_je, int two_jf,
                                   gsl_sf_result * result
                                   );
double gsl_sf_coupling_INCORRECT_6j(int two_ja, int two_jb, int two_jc,
                                    int two_jd, int two_je, int two_jf
                                    );
#endif /* !GSL_DISABLE_DEPRECATED */


__END_DECLS

#endif /* __GSL_SF_COUPLING_H__ */
