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ConstrainedOptPack_MeritFuncNLESqrResid.cpp
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00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 // Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
00005 //                  Copyright (2003) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
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00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
00025 // 
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00027 // @HEADER
00028 
00029 #include "ConstrainedOptPack_MeritFuncNLESqrResid.hpp"
00030 #include "AbstractLinAlgPack_LinAlgOpPack.hpp"
00031 
00032 namespace ConstrainedOptPack {
00033 
00034 MeritFuncNLESqrResid::MeritFuncNLESqrResid()
00035   : deriv_(0.0)
00036 {}
00037 
00038 value_type MeritFuncNLESqrResid::calc_deriv( const Vector& c_k )
00039 {
00040   using LinAlgOpPack::dot;
00041   return deriv_ = - dot(c_k,c_k);
00042 }
00043 
00044 // Overridden from MeritFuncNLP
00045 
00046 value_type MeritFuncNLESqrResid::value(const Vector& c) const
00047 {
00048   using LinAlgOpPack::dot;
00049   return 0.5 * dot(c,c);
00050 }
00051 
00052 value_type MeritFuncNLESqrResid::deriv() const
00053 {
00054   return deriv_;
00055 }
00056 
00057 void MeritFuncNLESqrResid::print_merit_func(std::ostream& out
00058   , const std::string& L ) const
00059 {
00060   out
00061     << L << "*** Define a square of constraint residuals merit funciton\n"
00062     << L << "*** (assumes Gc_k'*d_k + c_k = 0):\n"
00063     << L << "phi(c) = 1/2 * dot(c,c)\n"
00064     << L << "Dphi(x_k,d_k) = - dot(c_k,c_k)\n";
00065 }
00066 
00067 } // end namespace ConstrainedOptPack 
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