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/* roots/fsolver.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 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 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_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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