00001 // $Id: NOX_LineSearch_Backtrack.H,v 1.12 2007/06/21 16:22:46 rhoope Exp $ 00002 // $Source: /space/CVS/Trilinos/packages/nox/src/NOX_LineSearch_Backtrack.H,v $ 00003 00004 //@HEADER 00005 // ************************************************************************ 00006 // 00007 // NOX: An Object-Oriented Nonlinear Solver Package 00008 // Copyright (2002) Sandia Corporation 00009 // 00010 // LOCA: Library of Continuation Algorithms Package 00011 // Copyright (2005) Sandia Corporation 00012 // 00013 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive 00014 // license for use of this work by or on behalf of the U.S. Government. 00015 // 00016 // This library is free software; you can redistribute it and/or modify 00017 // it under the terms of the GNU Lesser General Public License as 00018 // published by the Free Software Foundation; either version 2.1 of the 00019 // License, or (at your option) any later version. 00020 // 00021 // This library is distributed in the hope that it will be useful, but 00022 // WITHOUT ANY WARRANTY; without even the implied warranty of 00023 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00024 // Lesser General Public License for more details. 00025 // 00026 // You should have received a copy of the GNU Lesser General Public 00027 // License along with this library; if not, write to the Free Software 00028 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 00029 // USA 00030 // 00031 // Questions? Contact Roger Pawlowski (rppawlo@sandia.gov) or 00032 // Eric Phipps (etphipp@sandia.gov), Sandia National Laboratories. 00033 // ************************************************************************ 00034 // CVS Information 00035 // $Source: /space/CVS/Trilinos/packages/nox/src/NOX_LineSearch_Backtrack.H,v $ 00036 // $Author: rhoope $ 00037 // $Date: 2007/06/21 16:22:46 $ 00038 // $Revision: 1.12 $ 00039 // ************************************************************************ 00040 //@HEADER 00041 00042 #ifndef NOX_LINESEARCH_BACKTRACK_H 00043 #define NOX_LINESEARCH_BACKTRACK_H 00044 00045 #include "NOX_LineSearch_Generic.H" // base class 00046 #include "NOX_Abstract_Vector.H" // for NOX::Abstract::Vector::NormType 00047 #include "Teuchos_RCP.hpp" 00048 00049 // Forward declarations 00050 namespace NOX { 00051 class Utils; 00052 namespace MeritFunction { 00053 class Generic; 00054 } 00055 } 00056 00057 namespace NOX { 00058 namespace LineSearch { 00059 00061 00085 class Backtrack : public Generic { 00086 00087 public: 00088 00090 Backtrack(const Teuchos::RCP<NOX::GlobalData>& gd, 00091 Teuchos::ParameterList& params); 00092 00094 ~Backtrack(); 00095 00096 // derived 00097 bool reset(const Teuchos::RCP<NOX::GlobalData>& gd, 00098 Teuchos::ParameterList& params); 00099 00100 // derived 00101 bool compute(NOX::Abstract::Group& newgrp, double& step, 00102 const NOX::Abstract::Vector& dir, 00103 const NOX::Solver::Generic& s); 00104 00105 private: 00106 00108 Teuchos::RCP<NOX::Utils> utils; 00109 00111 Teuchos::RCP<NOX::MeritFunction::Generic> meritFunctionPtr; 00112 00114 double minStep; 00115 00117 double defaultStep; 00118 00120 double recoveryStep; 00121 00122 double reductionFactor; 00123 00125 int maxIters; 00126 00127 }; 00128 } // namespace LineSearch 00129 } // namespace NOX 00130 #endif