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- /* roots/fsolver.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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 3 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 "gsl__config.h"
- #include <stdlib.h>
- #include <string.h>
- #include "gsl_errno.h"
- #include "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;
- }
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