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/* min/fsolver.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <string.h>
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#include <gsl/gsl_errno.h>
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#include <gsl/gsl_min.h>
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#include "min.h"
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static int
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compute_f_values (gsl_function * f, double x_minimum, double * f_minimum,
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double x_lower, double * f_lower,
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double x_upper, double * f_upper);
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static int
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compute_f_values (gsl_function * f, double x_minimum, double * f_minimum,
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double x_lower, double * f_lower,
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double x_upper, double * f_upper)
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{
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SAFE_FUNC_CALL(f, x_lower, f_lower);
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SAFE_FUNC_CALL(f, x_upper, f_upper);
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SAFE_FUNC_CALL(f, x_minimum, f_minimum);
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return GSL_SUCCESS;
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}
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int
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gsl_min_fminimizer_set (gsl_min_fminimizer * s,
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gsl_function * f,
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double x_minimum, double x_lower, double x_upper)
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{
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int status ;
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double f_minimum, f_lower, f_upper;
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status = compute_f_values (f, x_minimum, &f_minimum,
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x_lower, &f_lower,
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x_upper, &f_upper);
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if (status != GSL_SUCCESS)
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{
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return status ;
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}
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status = gsl_min_fminimizer_set_with_values (s, f, x_minimum, f_minimum,
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x_lower, f_lower,
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x_upper, f_upper);
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return status;
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}
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gsl_min_fminimizer *
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gsl_min_fminimizer_alloc (const gsl_min_fminimizer_type * T)
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{
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gsl_min_fminimizer * s =
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(gsl_min_fminimizer *) malloc (sizeof (gsl_min_fminimizer));
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if (s == 0)
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{
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GSL_ERROR_VAL ("failed to allocate space for minimizer struct",
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GSL_ENOMEM, 0);
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};
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s->state = malloc (T->size);
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if (s->state == 0)
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{
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free (s); /* exception in constructor, avoid memory leak */
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GSL_ERROR_VAL ("failed to allocate space for minimizer state",
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GSL_ENOMEM, 0);
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};
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s->type = T ;
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s->function = NULL;
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return s;
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}
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int
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gsl_min_fminimizer_set_with_values (gsl_min_fminimizer * s, gsl_function * f,
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double x_minimum, double f_minimum,
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double x_lower, double f_lower,
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double x_upper, double f_upper)
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{
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s->function = f;
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s->x_minimum = x_minimum;
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s->x_lower = x_lower;
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s->x_upper = x_upper;
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if (x_lower > x_upper)
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{
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GSL_ERROR ("invalid interval (lower > upper)", GSL_EINVAL);
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}
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if (x_minimum >= x_upper || x_minimum <= x_lower)
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{
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GSL_ERROR ("x_minimum must lie inside interval (lower < x < upper)",
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GSL_EINVAL);
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}
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s->f_lower = f_lower;
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s->f_upper = f_upper;
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s->f_minimum = f_minimum;
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if (f_minimum >= f_lower || f_minimum >= f_upper)
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{
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GSL_ERROR ("endpoints do not enclose a minimum", GSL_EINVAL);
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}
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return (s->type->set) (s->state, s->function,
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x_minimum, f_minimum,
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x_lower, f_lower,
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x_upper, f_upper);
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}
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int
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gsl_min_fminimizer_iterate (gsl_min_fminimizer * s)
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{
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return (s->type->iterate) (s->state, s->function,
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&(s->x_minimum), &(s->f_minimum),
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&(s->x_lower), &(s->f_lower),
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&(s->x_upper), &(s->f_upper));
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}
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void
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gsl_min_fminimizer_free (gsl_min_fminimizer * s)
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{
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RETURN_IF_NULL (s);
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free (s->state);
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free (s);
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}
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const char *
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gsl_min_fminimizer_name (const gsl_min_fminimizer * s)
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{
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return s->type->name;
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}
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/* Deprecated, use x_minimum instead */
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double
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gsl_min_fminimizer_minimum (const gsl_min_fminimizer * s)
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{
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return s->x_minimum;
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}
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double
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gsl_min_fminimizer_x_minimum (const gsl_min_fminimizer * s)
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{
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return s->x_minimum;
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}
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double
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gsl_min_fminimizer_x_lower (const gsl_min_fminimizer * s)
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{
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return s->x_lower;
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}
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double
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gsl_min_fminimizer_x_upper (const gsl_min_fminimizer * s)
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{
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return s->x_upper;
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}
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double
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gsl_min_fminimizer_f_minimum (const gsl_min_fminimizer * s)
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{
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return s->f_minimum;
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}
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double
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gsl_min_fminimizer_f_lower (const gsl_min_fminimizer * s)
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{
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return s->f_lower;
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}
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double
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gsl_min_fminimizer_f_upper (const gsl_min_fminimizer * s)
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{
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return s->f_upper;
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}
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