| /* integration/err.c |
| * |
| * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough |
| * |
| * 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. |
| */ |
| |
| #include <config.h> |
| #include <math.h> |
| #include <float.h> |
| #include <gsl/gsl_math.h> |
| #include <gsl/gsl_integration.h> |
| |
| static double rescale_error (double err, const double result_abs, const double result_asc) ; |
| |
| static double |
| rescale_error (double err, const double result_abs, const double result_asc) |
| { |
| err = fabs(err) ; |
| |
| if (result_asc != 0 && err != 0) |
| { |
| double scale = pow((200 * err / result_asc), 1.5) ; |
| |
| if (scale < 1) |
| { |
| err = result_asc * scale ; |
| } |
| else |
| { |
| err = result_asc ; |
| } |
| } |
| if (result_abs > GSL_DBL_MIN / (50 * GSL_DBL_EPSILON)) |
| { |
| double min_err = 50 * GSL_DBL_EPSILON * result_abs ; |
| |
| if (min_err > err) |
| { |
| err = min_err ; |
| } |
| } |
| |
| return err ; |
| } |
| |
