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# src/LinAlg/IpIdentityMatrix.hpp

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    00001 // Copyright (C) 2004, 2008 International Business Machines and others.
    00002 // All Rights Reserved.
    00003 // This code is published under the Eclipse Public License.
    00004 //
    00005 // $Id: IpIdentityMatrix.hpp 1861 2010-12-21 21:34:47Z andreasw $
    00006 //
    00007 // Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13
    00008
    00009 #ifndef __IPIDENTITYMATRIX_HPP__
    00010 #define __IPIDENTITYMATRIX_HPP__
    00011
    00012 #include "IpUtils.hpp"
    00013 #include "IpSymMatrix.hpp"
    00014
    00015 namespace Ipopt
    00016 {
    00017
    00021   class IdentityMatrix : public SymMatrix
    00022   {
    00023   public:
    00024
    00027
    00031     IdentityMatrix(const SymMatrixSpace* owner_space);
    00032
    00034     ~IdentityMatrix();
    00036
    00038     void SetFactor(Number factor)
    00039     {
    00040       factor_ = factor;
    00041     }
    00042
    00044     Number GetFactor() const
    00045     {
    00046       return factor_;
    00047     }
    00048
    00050     Index Dim() const;
    00051
    00052   protected:
    00055     virtual void MultVectorImpl(Number alpha, const Vector& x,
    00056                                 Number beta, Vector& y) const;
    00057
    00058     virtual void AddMSinvZImpl(Number alpha, const Vector& S,
    00059                                const Vector& Z, Vector& X) const;
    00060
    00063     virtual bool HasValidNumbersImpl() const;
    00064
    00065     virtual void ComputeRowAMaxImpl(Vector& rows_norms, bool init) const;
    00066
    00067     virtual void PrintImpl(const Journalist& jnlst,
    00068                            EJournalLevel level,
    00069                            EJournalCategory category,
    00070                            const std::string& name,
    00071                            Index indent,
    00072                            const std::string& prefix) const;
    00074
    00075   private:
    00085     IdentityMatrix();
    00086
    00088     IdentityMatrix(const IdentityMatrix&);
    00089
    00091     void operator=(const IdentityMatrix&);
    00093
    00095     Number factor_;
    00096   };
    00097
    00099   class IdentityMatrixSpace : public SymMatrixSpace
    00100   {
    00101   public:
    00105     IdentityMatrixSpace(Index dim)
    00106         :
    00107         SymMatrixSpace(dim)
    00108     {}
    00109
    00111     virtual ~IdentityMatrixSpace()
    00112     {}
    00114
    00117     virtual SymMatrix* MakeNewSymMatrix() const
    00118     {
    00119       return MakeNewIdentityMatrix();
    00120     }
    00121
    00123     IdentityMatrix* MakeNewIdentityMatrix() const
    00124     {
    00125       return new IdentityMatrix(this);
    00126     }
    00127
    00128   private:
    00138     IdentityMatrixSpace();
    00139
    00141     IdentityMatrixSpace(const IdentityMatrixSpace&);
    00142
    00144     void operator=(const IdentityMatrixSpace&);
    00146   };
    00147
    00148 } // namespace Ipopt
    00149 #endif

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