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/* integration/err.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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 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 <math.h>
#include <float.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_integration.h>
static double rescale_error (double err, const double result_abs, const double result_asc) ;
static double
rescale_error (double err, const double result_abs, const double result_asc)
{
err = fabs(err) ;
if (result_asc != 0 && err != 0)
{
double scale = pow((200 * err / result_asc), 1.5) ;
if (scale < 1)
{
err = result_asc * scale ;
}
else
{
err = result_asc ;
}
}
if (result_abs > GSL_DBL_MIN / (50 * GSL_DBL_EPSILON))
{
double min_err = 50 * GSL_DBL_EPSILON * result_abs ;
if (min_err > err)
{
err = min_err ;
}
}
return err ;
}
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