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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 <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)
{
RETURN_IF_NULL (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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