| /* sys/hypot.c |
| * |
| * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman, 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> |
| |
| double gsl_hypot (const double x, const double y); |
| |
| double gsl_hypot (const double x, const double y) |
| { |
| double xabs = fabs(x) ; |
| double yabs = fabs(y) ; |
| double min, max; |
| |
| if (xabs < yabs) { |
| min = xabs ; |
| max = yabs ; |
| } else { |
| min = yabs ; |
| max = xabs ; |
| } |
| |
| if (min == 0) |
| { |
| return max ; |
| } |
| |
| { |
| double u = min / max ; |
| return max * sqrt (1 + u * u) ; |
| } |
| } |
