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- /* specfunc/hyperg_2F0.c
- *
- * 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 */
- #include "gsl__config.h"
- #include "gsl_math.h"
- #include "gsl_errno.h"
- #include "gsl_sf_hyperg.h"
- #include "gsl_specfunc__error.h"
- #include "gsl_specfunc__hyperg.h"
- int
- gsl_sf_hyperg_2F0_e(const double a, const double b, const double x, gsl_sf_result * result)
- {
- if(x < 0.0) {
- /* Use "definition" 2F0(a,b,x) = (-1/x)^a U(a,1+a-b,-1/x).
- */
- gsl_sf_result U;
- double pre = pow(-1.0/x, a);
- int stat_U = gsl_sf_hyperg_U_e(a, 1.0+a-b, -1.0/x, &U);
- result->val = pre * U.val;
- result->err = GSL_DBL_EPSILON * fabs(result->val) + pre * U.err;
- return stat_U;
- }
- else if(x == 0.0) {
- result->val = 1.0;
- result->err = 0.0;
- return GSL_SUCCESS;
- }
- else {
- /* Use asymptotic series. ??
- */
- /* return hyperg_2F0_series(a, b, x, -1, result, &prec); */
- DOMAIN_ERROR(result);
- }
- }
- /*-*-*-*-*-*-*-*-*-* Functions w/ Natural Prototypes *-*-*-*-*-*-*-*-*-*-*/
- #include "gsl_specfunc__eval.h"
- double gsl_sf_hyperg_2F0(const double a, const double b, const double x)
- {
- EVAL_RESULT(gsl_sf_hyperg_2F0_e(a, b, x, &result));
- }
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