/* ode-initval/odeiv.c

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman

 * 

 * 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.

 */

/* Author:  G. Jungman

 */

#include <config.h>

#include <stdlib.h>

#include <gsl/gsl_errno.h>

#include <gsl/gsl_odeiv.h>

gsl_odeiv_step * 

gsl_odeiv_step_alloc(const gsl_odeiv_step_type * T, size_t dim)

{

  gsl_odeiv_step *s = (gsl_odeiv_step *) malloc (sizeof (gsl_odeiv_step));

  if (s == 0)

    {

      GSL_ERROR_NULL ("failed to allocate space for ode struct", GSL_ENOMEM);

    };

  s->type = T;

  s->dimension = dim;

  s->state = s->type->alloc(dim);

  if (s->state == 0)

    {

      free (s);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_NULL ("failed to allocate space for ode state", GSL_ENOMEM);

    };

  return s;

}

const char *

gsl_odeiv_step_name(const gsl_odeiv_step * s)

{

  return s->type->name;

}

unsigned int

gsl_odeiv_step_order(const gsl_odeiv_step * s)

{

  return s->type->order(s->state);

}

int

gsl_odeiv_step_apply(

  gsl_odeiv_step * s,

  double t,

  double h,

  double y[],

  double yerr[],

  const double dydt_in[],

  double dydt_out[],

  const gsl_odeiv_system * dydt)

{

  return s->type->apply(s->state, s->dimension, t, h, y, yerr, dydt_in, dydt_out, dydt);

}

int

gsl_odeiv_step_reset(gsl_odeiv_step * s)

{

  return s->type->reset(s->state, s->dimension);

}

void

gsl_odeiv_step_free(gsl_odeiv_step * s)

{

  RETURN_IF_NULL (s);

  s->type->free(s->state);

  free(s);

}