/* multimin/convergence.c

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Fabrice Rossi

 * 

 * 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 <gsl/gsl_multimin.h>

#include <gsl/gsl_blas.h>

int

gsl_multimin_test_gradient (const gsl_vector *g, double epsabs)

{

  double norm;

  if (epsabs < 0.0)

    {

      GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);

    }

  norm = gsl_blas_dnrm2(g);

  if (norm < epsabs)

    {

      return GSL_SUCCESS;

    }

  return GSL_CONTINUE;

}

int

gsl_multimin_test_size (const double size, double epsabs)

{

  if (epsabs < 0.0)

    {

      GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);

    }

  if (size < epsabs)

    {

      return GSL_SUCCESS;

    }

  return GSL_CONTINUE;

}