1 /* specfunc/result.c
2 *
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 #include <config.h>
23 #include <gsl/gsl_math.h>
24 #include <gsl/gsl_errno.h>
25 #include <gsl/gsl_sf_exp.h>
26 #include <gsl/gsl_sf_result.h>
27
28
29 int
gsl_sf_result_smash_e(const gsl_sf_result_e10 * re,gsl_sf_result * r)30 gsl_sf_result_smash_e(const gsl_sf_result_e10 * re, gsl_sf_result * r)
31 {
32 if(re->e10 == 0) {
33 /* nothing to smash */
34 r->val = re->val;
35 r->err = re->err;
36 return GSL_SUCCESS;
37 }
38 else {
39 const double av = fabs(re->val);
40 const double ae = fabs(re->err);
41
42 if( GSL_SQRT_DBL_MIN < av && av < GSL_SQRT_DBL_MAX
43 && GSL_SQRT_DBL_MIN < ae && ae < GSL_SQRT_DBL_MAX
44 && 0.49*GSL_LOG_DBL_MIN < re->e10 && re->e10 < 0.49*GSL_LOG_DBL_MAX
45 ) {
46 const double scale = exp(re->e10 * M_LN10);
47 r->val = re->val * scale;
48 r->err = re->err * scale;
49 return GSL_SUCCESS;
50 }
51 else {
52 return gsl_sf_exp_mult_err_e(re->e10*M_LN10, 0.0, re->val, re->err, r);
53 }
54 }
55 /*
56 int stat_v;
57 int stat_e;
58
59 if(re->val == 0.0) {
60 r->val = 0.0;
61 stat_v = GSL_SUCCESS;
62 }
63 else {
64 gsl_sf_result r_val;
65 const double s = GSL_SIGN(re->val);
66 const double x_v = re->e10*M_LN10 + log(fabs(re->val));
67 stat_v = gsl_sf_exp_e(x_v, &r_val);
68 r->val = s * r_val.val;
69 }
70
71 if(re->err == 0.0) {
72 r->err = 0.0;
73 stat_e = GSL_SUCCESS;
74 }
75 else if(re->val != 0.0) {
76 r->err = fabs(r->val * re->err/re->val);
77 stat_e = GSL_SUCCESS;
78 }
79 else {
80 gsl_sf_result r_err;
81 const double x_e = re->e10*M_LN10 + log(fabs(re->err));
82 stat_e = gsl_sf_exp_e(x_e, &r_err);
83 r->err = r_err.val;
84 }
85
86 return GSL_ERROR_SELECT_2(stat_v, stat_e);
87 */
88 }
89
90