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/* multiroots/convergence.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 <gsl/gsl_math.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_multiroots.h>
int
gsl_multiroot_test_delta (const gsl_vector * dx, const gsl_vector * x,
double epsabs, double epsrel)
{
size_t i;
int ok = 1;
const size_t n = x->size ;
if (epsrel < 0.0)
{
GSL_ERROR ("relative tolerance is negative", GSL_EBADTOL);
}
for (i = 0 ; i < n ; i++)
{
double xi = gsl_vector_get(x,i);
double dxi = gsl_vector_get(dx,i);
double tolerance = epsabs + epsrel * fabs(xi) ;
if (fabs(dxi) < tolerance)
{
ok = 1;
}
else
{
ok = 0;
break;
}
}
if (ok)
return GSL_SUCCESS ;
return GSL_CONTINUE;
}
int
gsl_multiroot_test_residual (const gsl_vector * f, double epsabs)
{
size_t i;
double residual = 0;
const size_t n = f->size;
if (epsabs < 0.0)
{
GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);
}
for (i = 0 ; i < n ; i++)
{
double fi = gsl_vector_get(f, i);
residual += fabs(fi);
}
if (residual < epsabs)
{
return GSL_SUCCESS;
}
return GSL_CONTINUE ;
}
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