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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 "gsl__config.h"
- #include <math.h>
- #include <float.h>
- #include "gsl_math.h"
- #include "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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