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/* multifit/convergence.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <gsl/gsl_math.h>
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#include <gsl/gsl_errno.h>
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#include <gsl/gsl_multifit_nlin.h>
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#include <gsl/gsl_blas.h>
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static double scaled_infnorm(const gsl_vector *x, const gsl_vector *g);
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/*
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gsl_multifit_fdfsolver_test()
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Convergence tests for nonlinear minimization
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(1) |dx_i| <= xtol * (1 + |x_i|) for all i
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(2) || g .* x ||_inf <= gtol ||f||^2
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(3) ||f(x+dx) - f(x)|| <= ftol * max(||f(x)||, 1)
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Inputs: s - fdfsolver
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xtol - tolerance for step size
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gtol - tolerance for gradient vector
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ftol - tolerance for residual vector
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info - (output)
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1 - stopped by small x step
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2 - stopped by small gradient
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3 - stopped by small residual vector change
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*/
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int
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gsl_multifit_fdfsolver_test (const gsl_multifit_fdfsolver * s,
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const double xtol, const double gtol,
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const double ftol, int *info)
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{
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int status;
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double gnorm, fnorm, phi;
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*info = 0;
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status = gsl_multifit_test_delta(s->dx, s->x, xtol*xtol, xtol);
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if (status == GSL_SUCCESS)
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{
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*info = 1;
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return GSL_SUCCESS;
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}
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/* compute gradient g = J^T f */
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(s->type->gradient) (s->state, s->g);
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/* compute gnorm = max_i( g_i * max(x_i, 1) ) */
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gnorm = scaled_infnorm(s->x, s->g);
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/* compute fnorm = ||f|| */
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fnorm = gsl_blas_dnrm2(s->f);
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phi = 0.5 * fnorm * fnorm;
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if (gnorm <= gtol * GSL_MAX(phi, 1.0))
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{
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*info = 2;
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return GSL_SUCCESS;
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}
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#if 0
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if (dfnorm <= ftol * GSL_MAX(fnorm, 1.0))
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{
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*info = 3;
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return GSL_SUCCESS;
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}
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#endif
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return GSL_CONTINUE;
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} /* gsl_multifit_fdfsolver_test() */
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int
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gsl_multifit_test_delta (const gsl_vector * dx, const gsl_vector * x,
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double epsabs, double epsrel)
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{
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size_t i;
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int ok = 1;
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const size_t n = x->size ;
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if (epsrel < 0.0)
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{
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GSL_ERROR ("relative tolerance is negative", GSL_EBADTOL);
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}
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for (i = 0 ; i < n ; i++)
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{
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double xi = gsl_vector_get(x,i);
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double dxi = gsl_vector_get(dx,i);
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double tolerance = epsabs + epsrel * fabs(xi) ;
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if (fabs(dxi) < tolerance)
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{
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ok = 1;
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}
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else
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{
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ok = 0;
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break;
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}
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}
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if (ok)
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return GSL_SUCCESS ;
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return GSL_CONTINUE;
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}
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int
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gsl_multifit_test_gradient (const gsl_vector * g, double epsabs)
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{
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size_t i;
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double residual = 0;
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const size_t n = g->size;
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if (epsabs < 0.0)
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{
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GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);
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}
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for (i = 0 ; i < n ; i++)
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{
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double gi = gsl_vector_get(g, i);
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residual += fabs(gi);
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}
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if (residual < epsabs)
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{
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return GSL_SUCCESS;
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}
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return GSL_CONTINUE ;
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}
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static double
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scaled_infnorm(const gsl_vector *x, const gsl_vector *g)
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{
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const size_t n = x->size;
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size_t i;
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double norm = 0.0;
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for (i = 0; i < n; ++i)
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{
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double xi = GSL_MAX(gsl_vector_get(x, i), 1.0);
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double gi = gsl_vector_get(g, i);
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double tmp = fabs(xi * gi);
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if (tmp > norm)
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norm = tmp;
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}
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return norm;
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}
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