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- /* min/convergence.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 "gsl_math.h"
- #include "gsl_errno.h"
- #include "gsl_min.h"
- int
- gsl_min_test_interval (double x_lower, double x_upper, double epsabs, double epsrel)
- {
- const double lower = x_lower;
- const double upper = x_upper;
- const double abs_lower = fabs(lower) ;
- const double abs_upper = fabs(upper) ;
- double min_abs, tolerance;
- if (epsrel < 0.0)
- GSL_ERROR ("relative tolerance is negative", GSL_EBADTOL);
-
- if (epsabs < 0.0)
- GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);
- if (lower > upper)
- GSL_ERROR ("lower bound larger than upper_bound", GSL_EINVAL);
- if ((lower > 0 && upper > 0) || (lower < 0 && upper < 0))
- {
- min_abs = GSL_MIN_DBL(abs_lower, abs_upper) ;
- }
- else
- {
- min_abs = 0;
- }
- tolerance = epsabs + epsrel * min_abs ;
-
- if (fabs(upper - lower) < tolerance)
- return GSL_SUCCESS;
-
- return GSL_CONTINUE ;
- }
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