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- /* min/fsolver.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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_min.h"
- #include "gsl_min__min.h"
- static int
- compute_f_values (gsl_function * f, double x_minimum, double * f_minimum,
- double x_lower, double * f_lower,
- double x_upper, double * f_upper);
- static int
- compute_f_values (gsl_function * f, double x_minimum, double * f_minimum,
- double x_lower, double * f_lower,
- double x_upper, double * f_upper)
- {
- SAFE_FUNC_CALL(f, x_lower, f_lower);
- SAFE_FUNC_CALL(f, x_upper, f_upper);
- SAFE_FUNC_CALL(f, x_minimum, f_minimum);
- return GSL_SUCCESS;
- }
- int
- gsl_min_fminimizer_set (gsl_min_fminimizer * s,
- gsl_function * f,
- double x_minimum, double x_lower, double x_upper)
- {
- int status ;
- double f_minimum, f_lower, f_upper;
- status = compute_f_values (f, x_minimum, &f_minimum,
- x_lower, &f_lower,
- x_upper, &f_upper);
- if (status != GSL_SUCCESS)
- {
- return status ;
- }
-
- status = gsl_min_fminimizer_set_with_values (s, f, x_minimum, f_minimum,
- x_lower, f_lower,
- x_upper, f_upper);
- return status;
- }
- gsl_min_fminimizer *
- gsl_min_fminimizer_alloc (const gsl_min_fminimizer_type * T)
- {
- gsl_min_fminimizer * s =
- (gsl_min_fminimizer *) malloc (sizeof (gsl_min_fminimizer));
- if (s == 0)
- {
- GSL_ERROR_VAL ("failed to allocate space for minimizer 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 minimizer state",
- GSL_ENOMEM, 0);
- };
- s->type = T ;
- s->function = NULL;
- return s;
- }
- int
- gsl_min_fminimizer_set_with_values (gsl_min_fminimizer * s, gsl_function * f,
- double x_minimum, double f_minimum,
- double x_lower, double f_lower,
- double x_upper, double f_upper)
- {
- s->function = f;
- s->x_minimum = x_minimum;
- s->x_lower = x_lower;
- s->x_upper = x_upper;
- if (x_lower > x_upper)
- {
- GSL_ERROR ("invalid interval (lower > upper)", GSL_EINVAL);
- }
- if (x_minimum >= x_upper || x_minimum <= x_lower)
- {
- GSL_ERROR ("x_minimum must lie inside interval (lower < x < upper)",
- GSL_EINVAL);
- }
- s->f_lower = f_lower;
- s->f_upper = f_upper;
- s->f_minimum = f_minimum;
- if (f_minimum >= f_lower || f_minimum >= f_upper)
- {
- GSL_ERROR ("endpoints do not enclose a minimum", GSL_EINVAL);
- }
- return (s->type->set) (s->state, s->function,
- x_minimum, f_minimum,
- x_lower, f_lower,
- x_upper, f_upper);
- }
- int
- gsl_min_fminimizer_iterate (gsl_min_fminimizer * s)
- {
- return (s->type->iterate) (s->state, s->function,
- &(s->x_minimum), &(s->f_minimum),
- &(s->x_lower), &(s->f_lower),
- &(s->x_upper), &(s->f_upper));
- }
- void
- gsl_min_fminimizer_free (gsl_min_fminimizer * s)
- {
- free (s->state);
- free (s);
- }
- const char *
- gsl_min_fminimizer_name (const gsl_min_fminimizer * s)
- {
- return s->type->name;
- }
- /* Deprecated, use x_minimum instead */
- double
- gsl_min_fminimizer_minimum (const gsl_min_fminimizer * s)
- {
- return s->x_minimum;
- }
- double
- gsl_min_fminimizer_x_minimum (const gsl_min_fminimizer * s)
- {
- return s->x_minimum;
- }
- double
- gsl_min_fminimizer_x_lower (const gsl_min_fminimizer * s)
- {
- return s->x_lower;
- }
- double
- gsl_min_fminimizer_x_upper (const gsl_min_fminimizer * s)
- {
- return s->x_upper;
- }
- double
- gsl_min_fminimizer_f_minimum (const gsl_min_fminimizer * s)
- {
- return s->f_minimum;
- }
- double
- gsl_min_fminimizer_f_lower (const gsl_min_fminimizer * s)
- {
- return s->f_lower;
- }
- double
- gsl_min_fminimizer_f_upper (const gsl_min_fminimizer * s)
- {
- return s->f_upper;
- }
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