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155 lines
5.8 KiB
155 lines
5.8 KiB
/* -*- c++ -*- (enables emacs c++ mode) */
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/*===========================================================================
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Copyright (C) 2002-2012 Yves Renard
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This file is a part of GETFEM++
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Getfem++ is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version along with the GCC Runtime Library
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Exception either version 3.1 or (at your option) any later version.
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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 MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License and GCC Runtime Library Exception for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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As a special exception, you may use this file as it is a part of a free
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software library without restriction. Specifically, if other files
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instantiate templates or use macros or inline functions from this file,
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or you compile this file and link it with other files to produce an
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executable, this file does not by itself cause the resulting executable
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to be covered by the GNU Lesser General Public License. This exception
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does not however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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===========================================================================*/
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/**@file gmm_iter.h
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@author Yves Renard <Yves.Renard@insa-lyon.fr>
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@date February 10, 2003.
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@brief Iteration object.
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*/
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#ifndef GMM_ITER_H__
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#define GMM_ITER_H__
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#include "gmm_kernel.h"
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namespace gmm {
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/** The Iteration object calculates whether the solution has reached the
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desired accuracy, or whether the maximum number of iterations has
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been reached.
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The method finished() checks the convergence. The first()
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method is used to determine the first iteration of the loop.
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*/
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class iteration {
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protected :
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double rhsn; /* Right hand side norm. */
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size_type maxiter; /* Max. number of iterations. */
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int noise; /* if noise > 0 iterations are printed. */
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double resmax; /* maximum residu. */
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double resminreach, resadd;
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double diverged_res; /* Threshold beyond which the iterative */
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/* is considered to diverge. */
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size_type nit; /* iteration number. */
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double res; /* last computed residu. */
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std::string name; /* eventually, name of the method. */
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bool written;
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void (*callback)(const gmm::iteration&);
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public :
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void init(void) {
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nit = 0; res = 0.0; written = false;
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resminreach = 1E200; resadd = 0.0;
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callback = 0;
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}
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iteration(double r = 1.0E-8, int noi = 0, size_type mit = size_type(-1),
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double div_res = 1E200)
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: rhsn(1.0), maxiter(mit), noise(noi), resmax(r), diverged_res(div_res)
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{ init(); }
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void operator ++(int) { nit++; written = false; resadd += res; }
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void operator ++() { (*this)++; }
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bool first(void) { return nit == 0; }
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/* get/set the "noisyness" (verbosity) of the solvers */
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int get_noisy(void) const { return noise; }
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void set_noisy(int n) { noise = n; }
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void reduce_noisy(void) { if (noise > 0) noise--; }
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double get_resmax(void) const { return resmax; }
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void set_resmax(double r) { resmax = r; }
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double get_res() const { return res; }
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void enforce_converged(bool c = true)
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{ if (c) res = double(0); else res = rhsn * resmax + double(1); }
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/* change the user-definable callback, called after each iteration */
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void set_callback(void (*t)(const gmm::iteration&)) {
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callback = t;
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}
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double get_diverged_residual(void) const { return diverged_res; }
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void set_diverged_residual(double r) { diverged_res = r; }
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size_type get_iteration(void) const { return nit; }
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void set_iteration(size_type i) { nit = i; }
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size_type get_maxiter(void) const { return maxiter; }
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void set_maxiter(size_type i) { maxiter = i; }
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double get_rhsnorm(void) const { return rhsn; }
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void set_rhsnorm(double r) { rhsn = r; }
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bool converged(void) { return res <= rhsn * resmax; }
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bool converged(double nr) {
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res = gmm::abs(nr); resminreach = std::min(resminreach, res);
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return converged();
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}
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template <typename VECT> bool converged(const VECT &v)
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{ return converged(gmm::vect_norm2(v)); }
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bool diverged(void)
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{ return (nit>=maxiter) || (res>=rhsn*diverged_res && nit > 4); }
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bool diverged(double nr) {
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res = gmm::abs(nr); resminreach = std::min(resminreach, res);
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return diverged();
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}
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bool finished(double nr) {
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if (callback) callback(*this);
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if (noise > 0 && !written) {
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double a = (rhsn == 0) ? 1.0 : rhsn;
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converged(nr);
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cout << name << " iter " << nit << " residual "
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<< gmm::abs(nr) / a;
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// if (nit % 100 == 0 && nit > 0) {
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// cout << " (residual min " << resminreach / a << " mean val "
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// << resadd / (100.0 * a) << " )";
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// resadd = 0.0;
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// }
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cout << endl;
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written = true;
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}
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return (converged(nr) || diverged(nr));
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}
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template <typename VECT> bool finished_vect(const VECT &v)
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{ return finished(double(gmm::vect_norm2(v))); }
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void set_name(const std::string &n) { name = n; }
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const std::string &get_name(void) const { return name; }
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};
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}
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#endif /* GMM_ITER_H__ */
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