AbstractLinAlgPack_MatrixSymIdent.cpp

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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
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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
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00028 
00029 #include <assert.h>
00030 
00031 #include <ostream>
00032 
00033 #include "AbstractLinAlgPack_MatrixSymIdent.hpp"
00034 #include "AbstractLinAlgPack_VectorStdOps.hpp"
00035 #include "AbstractLinAlgPack_LinAlgOpPack.hpp"
00036 
00037 namespace AbstractLinAlgPack {
00038 
00039 // Constructors/initalizers
00040 
00041 MatrixSymIdent::MatrixSymIdent(
00042   const VectorSpace::space_ptr_t&          vec_space
00043   ,const value_type                        scale
00044   )
00045 {
00046   this->initialize(vec_space,scale);
00047 }
00048 
00049 void MatrixSymIdent::initialize(
00050   const VectorSpace::space_ptr_t&          vec_space
00051   ,const value_type                        scale
00052   )
00053 {
00054   vec_space_ = vec_space;
00055   scale_     = scale;
00056 }
00057 
00058 // Overridden from MatrixBase
00059 
00060 size_type MatrixSymIdent::rows() const
00061 {
00062   return vec_space_.get() ? vec_space_->dim() : 0;
00063 }
00064 
00065 size_type MatrixSymIdent::nz() const
00066 {
00067   return vec_space_.get() ? vec_space_->dim() : 0;
00068 }
00069 
00070 // Overridden from MatrixOp
00071 
00072 const VectorSpace& MatrixSymIdent::space_cols() const {
00073   return *vec_space_;
00074 }
00075 
00076 std::ostream& MatrixSymIdent::output(std::ostream& out) const
00077 {
00078   out << "Identity matrix of dimension " << rows() << " x " << rows() << std::endl;
00079   return out;
00080 }
00081 
00082 void MatrixSymIdent::Vp_StMtV(
00083   VectorMutable* y, value_type a, BLAS_Cpp::Transp M_trans
00084   ,const Vector& x, value_type b
00085   ) const
00086 {
00087   AbstractLinAlgPack::Vp_MtV_assert_compatibility( y, *this, BLAS_Cpp::no_trans, x );
00088   Vt_S(y,b);
00089     Vp_StV(y,a*scale_,x);
00090 }
00091 
00092 // Overridden from MatrixNonsing
00093 
00094 void MatrixSymIdent::V_InvMtV(
00095   VectorMutable* y, BLAS_Cpp::Transp M_trans, const Vector& x
00096   ) const
00097 {
00098   AbstractLinAlgPack::Vp_MtV_assert_compatibility( y, *this, BLAS_Cpp::no_trans, x );
00099   LinAlgOpPack::V_StV(y,1.0/scale_,x);
00100 }
00101 
00102 } // end namespace AbstractLinAlgPack

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