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/* multifit/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_multifit_nlin.h>
gsl_multifit_fsolver *
gsl_multifit_fsolver_alloc (const gsl_multifit_fsolver_type * T,
size_t n, size_t p)
{
int status;
gsl_multifit_fsolver * s;
if (n < p)
{
GSL_ERROR_VAL ("insufficient data points, n < p", GSL_EINVAL, 0);
}
s = (gsl_multifit_fsolver *) malloc (sizeof (gsl_multifit_fsolver));
if (s == 0)
{
GSL_ERROR_VAL ("failed to allocate space for multifit solver struct",
GSL_ENOMEM, 0);
}
s->x = gsl_vector_calloc (p);
if (s->x == 0)
{
free (s);
GSL_ERROR_VAL ("failed to allocate space for x", GSL_ENOMEM, 0);
}
s->f = gsl_vector_calloc (n);
if (s->f == 0)
{
gsl_vector_free (s->x);
free (s);
GSL_ERROR_VAL ("failed to allocate space for f", GSL_ENOMEM, 0);
}
s->dx = gsl_vector_calloc (p);
if (s->dx == 0)
{
gsl_vector_free (s->x);
gsl_vector_free (s->f);
free (s);
GSL_ERROR_VAL ("failed to allocate space for dx", GSL_ENOMEM, 0);
}
s->state = malloc (T->size);
if (s->state == 0)
{
gsl_vector_free (s->dx);
gsl_vector_free (s->x);
gsl_vector_free (s->f);
free (s); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for multifit solver state",
GSL_ENOMEM, 0);
}
s->type = T ;
status = (s->type->alloc)(s->state, n, p);
if (status != GSL_SUCCESS)
{
(s->type->free)(s->state);
free (s->state);
gsl_vector_free (s->dx);
gsl_vector_free (s->x);
gsl_vector_free (s->f);
free (s); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to set solver", status, 0);
}
s->function = NULL;
return s;
}
int
gsl_multifit_fsolver_set (gsl_multifit_fsolver * s,
gsl_multifit_function * f,
const gsl_vector * x)
{
if (s->f->size != f->n)
{
GSL_ERROR ("function size does not match solver", GSL_EBADLEN);
}
if (s->x->size != x->size)
{
GSL_ERROR ("vector length does not match solver", GSL_EBADLEN);
}
s->function = f;
gsl_vector_memcpy(s->x,x);
return (s->type->set) (s->state, s->function, s->x, s->f, s->dx);
}
int
gsl_multifit_fsolver_iterate (gsl_multifit_fsolver * s)
{
return (s->type->iterate) (s->state, s->function, s->x, s->f, s->dx);
}
void
gsl_multifit_fsolver_free (gsl_multifit_fsolver * s)
{
(s->type->free) (s->state);
free (s->state);
gsl_vector_free (s->dx);
gsl_vector_free (s->x);
gsl_vector_free (s->f);
free (s);
}
const char *
gsl_multifit_fsolver_name (const gsl_multifit_fsolver * s)
{
return s->type->name;
}
gsl_vector *
gsl_multifit_fsolver_position (const gsl_multifit_fsolver * s)
{
return s->x;
}
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