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# /home/coin/svn-release/Alps-1.4.6/Clp/src/ClpDualRowPivot.hpp

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    00001 /* $Id: ClpDualRowPivot.hpp 1732 2011-05-31 08:09:41Z forrest $ */
    00002 // Copyright (C) 2002, International Business Machines
    00003 // Corporation and others.  All Rights Reserved.
    00004 // This code is licensed under the terms of the Eclipse Public License (EPL).
    00005
    00006 #ifndef ClpDualRowPivot_H
    00007 #define ClpDualRowPivot_H
    00008
    00009 class ClpSimplex;
    00010 class CoinIndexedVector;
    00011
    00012 //#############################################################################
    00013
    00022 class ClpDualRowPivot  {
    00023
    00024 public:
    00025
    00027
    00028
    00030      virtual int pivotRow() = 0;
    00031
    00034      virtual double updateWeights(CoinIndexedVector * input,
    00035                                   CoinIndexedVector * spare,
    00036                                   CoinIndexedVector * spare2,
    00037                                   CoinIndexedVector * updatedColumn) = 0;
    00038
    00045      /* FIXME: this was pure virtul (=0). Why? */
    00046      virtual void updatePrimalSolution(CoinIndexedVector * input,
    00047                                        double theta,
    00048                                        double & changeInObjective) = 0;
    00059      virtual void saveWeights(ClpSimplex * model, int mode);
    00061      virtual void checkAccuracy();
    00063      virtual void unrollWeights();
    00065      virtual void clearArrays();
    00067      virtual bool looksOptimal() const {
    00068           return false;
    00069      }
    00071      virtual void maximumPivotsChanged() {}
    00073
    00074
    00076
    00077
    00078      ClpDualRowPivot();
    00079
    00081      ClpDualRowPivot(const ClpDualRowPivot &);
    00082
    00084      ClpDualRowPivot & operator=(const ClpDualRowPivot& rhs);
    00085
    00087      virtual ~ClpDualRowPivot ();
    00088
    00090      virtual ClpDualRowPivot * clone(bool copyData = true) const = 0;
    00091
    00093
    00095
    00096
    00097      inline ClpSimplex * model() {
    00098           return model_;
    00099      }
    00100
    00102      inline void setModel(ClpSimplex * newmodel) {
    00103           model_ = newmodel;
    00104      }
    00105
    00107      inline int type() {
    00108           return type_;
    00109      }
    00110
    00112
    00113      //---------------------------------------------------------------------------
    00114
    00115 protected:
    00117
    00118
    00119      ClpSimplex * model_;
    00121      int type_;
    00123 };
    00124 #ifndef CLP_DUAL_COLUMN_MULTIPLIER
    00125 //#define CLP_DUAL_COLUMN_MULTIPLIER 0.99999
    00126 #endif
    00127 #endif