| /* min/fsolver.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. |
| */ |
| |
| #include <config.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <gsl/gsl_errno.h> |
| #include <gsl/gsl_min.h> |
| |
| #include "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; |
| } |
| |