| /* roots/fsolver.c |
| * |
| * Copyright (C) 1996, 1997, 1998, 1999, 2000 Reid Priedhorsky, 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 <stdlib.h> |
| #include <string.h> |
| #include <gsl/gsl_errno.h> |
| #include <gsl/gsl_roots.h> |
| |
| gsl_root_fsolver * |
| gsl_root_fsolver_alloc (const gsl_root_fsolver_type * T) |
| { |
| gsl_root_fsolver * s = (gsl_root_fsolver *) malloc (sizeof (gsl_root_fsolver)); |
| |
| if (s == 0) |
| { |
| GSL_ERROR_VAL ("failed to allocate space for root solver struct", |
| GSL_ENOMEM, 0); |
| }; |
| |
| s->state = malloc (T->size); |
| |
| if (s->state == 0) |
| { |
| free (s); /* exception in constructor, avoid memory leak */ |
| |
| GSL_ERROR_VAL ("failed to allocate space for root solver state", |
| GSL_ENOMEM, 0); |
| }; |
| |
| s->type = T ; |
| s->function = NULL ; |
| |
| return s; |
| } |
| |
| int |
| gsl_root_fsolver_set (gsl_root_fsolver * s, gsl_function * f, double x_lower, double x_upper) |
| { |
| if (x_lower > x_upper) |
| { |
| GSL_ERROR ("invalid interval (lower > upper)", GSL_EINVAL); |
| } |
| |
| s->function = f; |
| s->root = 0.5 * (x_lower + x_upper); /* initial estimate */ |
| s->x_lower = x_lower; |
| s->x_upper = x_upper; |
| |
| return (s->type->set) (s->state, s->function, &(s->root), x_lower, x_upper); |
| } |
| |
| int |
| gsl_root_fsolver_iterate (gsl_root_fsolver * s) |
| { |
| return (s->type->iterate) (s->state, |
| s->function, &(s->root), |
| &(s->x_lower), &(s->x_upper)); |
| } |
| |
| void |
| gsl_root_fsolver_free (gsl_root_fsolver * s) |
| { |
| free (s->state); |
| free (s); |
| } |
| |
| const char * |
| gsl_root_fsolver_name (const gsl_root_fsolver * s) |
| { |
| return s->type->name; |
| } |
| |
| double |
| gsl_root_fsolver_root (const gsl_root_fsolver * s) |
| { |
| return s->root; |
| } |
| |
| double |
| gsl_root_fsolver_x_lower (const gsl_root_fsolver * s) |
| { |
| return s->x_lower; |
| } |
| |
| double |
| gsl_root_fsolver_x_upper (const gsl_root_fsolver * s) |
| { |
| return s->x_upper; |
| } |
| |