1 /* specfunc/gsl_sf_erf.h
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 /* Author: G. Jungman */
22 #ifndef __GSL_SF_ERF_H__
23 #define __GSL_SF_ERF_H__
25 #include <gsl/gsl_sf_result.h>
30 # define __BEGIN_DECLS extern "C" {
31 # define __END_DECLS }
33 # define __BEGIN_DECLS /* empty */
34 # define __END_DECLS /* empty */
40 /* Complementary Error Function
41 * erfc(x) := 2/Sqrt[Pi] Integrate[Exp[-t^2], {t,x,Infinity}]
45 int gsl_sf_erfc_e(double x, gsl_sf_result * result);
46 double gsl_sf_erfc(double x);
49 /* Log Complementary Error Function
53 int gsl_sf_log_erfc_e(double x, gsl_sf_result * result);
54 double gsl_sf_log_erfc(double x);
58 * erf(x) := 2/Sqrt[Pi] Integrate[Exp[-t^2], {t,0,x}]
62 int gsl_sf_erf_e(double x, gsl_sf_result * result);
63 double gsl_sf_erf(double x);
66 /* Probability functions:
67 * Z(x) : Abramowitz+Stegun 26.2.1
68 * Q(x) : Abramowitz+Stegun 26.2.3
72 int gsl_sf_erf_Z_e(double x, gsl_sf_result * result);
73 int gsl_sf_erf_Q_e(double x, gsl_sf_result * result);
74 double gsl_sf_erf_Z(double x);
75 double gsl_sf_erf_Q(double x);
78 /* Hazard function, also known as the inverse Mill's ratio.
81 * = Sqrt[2/Pi] Exp[-x^2 / 2] / Erfc[x/Sqrt[2]]
83 * exceptions: GSL_EUNDRFLW
85 int gsl_sf_hazard_e(double x, gsl_sf_result * result);
86 double gsl_sf_hazard(double x);
91 #endif /* __GSL_SF_ERF_H__ */