1/* specfunc/gsl_sf_log.h
2 *
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2004 Gerard Jungman
4 *
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.
9 *
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.
14 *
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.
18 */
19
20/* Author: G. Jungman */
21
22#ifndef __GSL_SF_LOG_H__
23#define __GSL_SF_LOG_H__
24
25#include <gsl/gsl_sf_result.h>
26
27#undef __BEGIN_DECLS
28#undef __END_DECLS
29#ifdef __cplusplus
30# define __BEGIN_DECLS extern "C" {
31# define __END_DECLS }
32#else
33# define __BEGIN_DECLS /* empty */
34# define __END_DECLS /* empty */
35#endif
36
37__BEGIN_DECLS
38
39
40/* Provide a logarithm function with GSL semantics.
41 *
42 * exceptions: GSL_EDOM
43 */
44int gsl_sf_log_e(const double x, gsl_sf_result * result);
45double gsl_sf_log(const double x);
46
47
48/* Log(|x|)
49 *
50 * exceptions: GSL_EDOM
51 */
52int gsl_sf_log_abs_e(const double x, gsl_sf_result * result);
53double gsl_sf_log_abs(const double x);
54
55
56/* Complex Logarithm
57 * exp(lnr + I theta) = zr + I zi
58 * Returns argument in [-pi,pi].
59 *
60 * exceptions: GSL_EDOM
61 */
62int gsl_sf_complex_log_e(const double zr, const double zi, gsl_sf_result * lnr, gsl_sf_result * theta);
63
64
65/* Log(1 + x)
66 *
67 * exceptions: GSL_EDOM
68 */
69int gsl_sf_log_1plusx_e(const double x, gsl_sf_result * result);
70double gsl_sf_log_1plusx(const double x);
71
72
73/* Log(1 + x) - x
74 *
75 * exceptions: GSL_EDOM
76 */
77int gsl_sf_log_1plusx_mx_e(const double x, gsl_sf_result * result);
78double gsl_sf_log_1plusx_mx(const double x);
79
80__END_DECLS
81
82#endif /* __GSL_SF_LOG_H__ */
83