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/* 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 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 <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;
}
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