1 /* multifit/convergence.c
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 #include <gsl/gsl_math.h>
22 #include <gsl/gsl_errno.h>
23 #include <gsl/gsl_multifit_nlin.h>
26 gsl_multifit_test_delta (const gsl_vector * dx, const gsl_vector * x,
27 double epsabs, double epsrel)
31 const size_t n = x->size ;
35 GSL_ERROR ("relative tolerance is negative", GSL_EBADTOL);
38 for (i = 0 ; i < n ; i++)
40 double xi = gsl_vector_get(x,i);
41 double dxi = gsl_vector_get(dx,i);
42 double tolerance = epsabs + epsrel * fabs(xi) ;
44 if (fabs(dxi) < tolerance)
62 gsl_multifit_test_gradient (const gsl_vector * g, double epsabs)
68 const size_t n = g->size;
72 GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);
75 for (i = 0 ; i < n ; i++)
77 double gi = gsl_vector_get(g, i);
83 if (residual < epsabs)