| /* specfunc/result.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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| |
| /* Author: G. Jungman */ |
| |
| #include <config.h> |
| #include <gsl/gsl_math.h> |
| #include <gsl/gsl_errno.h> |
| #include <gsl/gsl_sf_exp.h> |
| #include <gsl/gsl_sf_result.h> |
| |
| |
| int |
| gsl_sf_result_smash_e(const gsl_sf_result_e10 * re, gsl_sf_result * r) |
| { |
| if(re->e10 == 0) { |
| /* nothing to smash */ |
| r->val = re->val; |
| r->err = re->err; |
| return GSL_SUCCESS; |
| } |
| else { |
| const double av = fabs(re->val); |
| const double ae = fabs(re->err); |
| |
| if( GSL_SQRT_DBL_MIN < av && av < GSL_SQRT_DBL_MAX |
| && GSL_SQRT_DBL_MIN < ae && ae < GSL_SQRT_DBL_MAX |
| && 0.49*GSL_LOG_DBL_MIN < re->e10 && re->e10 < 0.49*GSL_LOG_DBL_MAX |
| ) { |
| const double scale = exp(re->e10 * M_LN10); |
| r->val = re->val * scale; |
| r->err = re->err * scale; |
| return GSL_SUCCESS; |
| } |
| else { |
| return gsl_sf_exp_mult_err_e(re->e10*M_LN10, 0.0, re->val, re->err, r); |
| } |
| } |
| /* |
| int stat_v; |
| int stat_e; |
| |
| if(re->val == 0.0) { |
| r->val = 0.0; |
| stat_v = GSL_SUCCESS; |
| } |
| else { |
| gsl_sf_result r_val; |
| const double s = GSL_SIGN(re->val); |
| const double x_v = re->e10*M_LN10 + log(fabs(re->val)); |
| stat_v = gsl_sf_exp_e(x_v, &r_val); |
| r->val = s * r_val.val; |
| } |
| |
| if(re->err == 0.0) { |
| r->err = 0.0; |
| stat_e = GSL_SUCCESS; |
| } |
| else if(re->val != 0.0) { |
| r->err = fabs(r->val * re->err/re->val); |
| stat_e = GSL_SUCCESS; |
| } |
| else { |
| gsl_sf_result r_err; |
| const double x_e = re->e10*M_LN10 + log(fabs(re->err)); |
| stat_e = gsl_sf_exp_e(x_e, &r_err); |
| r->err = r_err.val; |
| } |
| |
| return GSL_ERROR_SELECT_2(stat_v, stat_e); |
| */ |
| } |
| |