MoochoPack_QuasiRangeSpaceStepStd_Strategy.cpp

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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
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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
00021 // License along with this library; if not, write to the Free Software
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00023 // USA
00024 // Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
00025 // 
00026 // ***********************************************************************
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00028 
00029 #include "MoochoPack_QuasiRangeSpaceStepStd_Strategy.hpp"
00030 #include "MoochoPack_NLPAlgoState.hpp"
00031 #include "AbstractLinAlgPack_MatrixOpNonsing.hpp"
00032 #include "AbstractLinAlgPack_VectorSpace.hpp"
00033 #include "AbstractLinAlgPack_LinAlgOpPack.hpp"
00034 
00035 namespace MoochoPack {
00036 
00037 bool QuasiRangeSpaceStepStd_Strategy::solve_quasi_range_space_step(
00038   std::ostream& out, EJournalOutputLevel olevel, NLPAlgo *algo, NLPAlgoState *s
00039   ,const Vector& xo, const Vector& c_xo, VectorMutable* v
00040     )
00041 {
00042   using LinAlgOpPack::V_InvMtV;
00043   using LinAlgOpPack::V_StMtV;
00044   const MatrixOpNonsing
00045     &R_k = s->R().get_k(0);
00046   VectorSpace::vec_mut_ptr_t
00047     vy = R_k.space_rows().create_member();
00048   // vy = inv(R_k) * c_xo
00049   V_InvMtV( vy.get(), R_k, BLAS_Cpp::no_trans, c_xo );
00050   // v = -Y_k*vy
00051   V_StMtV( v, -1.0, s->Y().get_k(0), BLAS_Cpp::no_trans, *vy );
00052 
00053   return true;
00054 }
00055 
00056 void QuasiRangeSpaceStepStd_Strategy::print_step( std::ostream& out, const std::string& L ) const
00057 {
00058   out << L << "*** Compute the approximate range space step:\n"
00059     << L << "vy = inv(R_k) * c_xo\n"
00060     << L << "v = -Y_k*vy\n";
00061 }
00062 
00063 } // end namespace MoochoPack
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