| /* multiroots/enorm.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. |
| */ |
| |
| static double enorm (const gsl_vector * f); |
| |
| static double enorm (const gsl_vector * f) { |
| double e2 = 0 ; |
| size_t i, n = f->size ; |
| for (i = 0; i < n ; i++) { |
| double fi= gsl_vector_get(f, i); |
| e2 += fi * fi ; |
| } |
| return sqrt(e2); |
| } |
| |
| |
| |
