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# /home/coin/svn-release/Blis-0.94.1/Osi/src/Osi/OsiColCut.hpp

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    00001 // Copyright (C) 2000, International Business Machines
    00002 // Corporation and others.  All Rights Reserved.
    00003 // This code is licensed under the terms of the Eclipse Public License (EPL).
    00004
    00005 #ifndef OsiColCut_H
    00006 #define OsiColCut_H
    00007
    00008 #include <string>
    00009
    00010 #include "CoinPackedVector.hpp"
    00011
    00012 #include "OsiCollections.hpp"
    00013 #include "OsiCut.hpp"
    00014
    00023 class OsiColCut : public OsiCut {
    00024    friend void OsiColCutUnitTest(const OsiSolverInterface * baseSiP,
    00025                                  const std::string & mpsDir);
    00026
    00027 public:
    00028
    00029   //----------------------------------------------------------------
    00030
    00033
    00034   inline void setLbs(
    00035     int nElements,
    00036     const int * colIndices,
    00037     const double * lbElements );
    00038
    00040   inline void setLbs( const CoinPackedVector & lbs );
    00041
    00043   inline void setUbs(
    00044     int nElements,
    00045     const int * colIndices,
    00046     const double * ubElements );
    00047
    00049   inline void setUbs( const CoinPackedVector & ubs );
    00051
    00052   //----------------------------------------------------------------
    00053
    00056
    00057   inline const CoinPackedVector & lbs() const;
    00059   inline const CoinPackedVector & ubs() const;
    00061
    00064 #if __GNUC__ != 2
    00065   using OsiCut::operator== ;
    00066 #endif
    00067
    00070   inline virtual bool operator==(const OsiColCut& rhs) const;
    00071
    00072 #if __GNUC__ != 2
    00073   using OsiCut::operator!= ;
    00074 #endif
    00076   inline virtual bool operator!=(const OsiColCut& rhs) const;
    00077
    00078
    00079
    00080   //----------------------------------------------------------------
    00081
    00091   inline virtual bool consistent() const;
    00092
    00100   inline virtual bool consistent(const OsiSolverInterface& im) const;
    00101
    00110   inline virtual bool infeasible(const OsiSolverInterface &im) const;
    00115   virtual double violated(const double * solution) const;
    00117
    00118   //----------------------------------------------------------------
    00119
    00122
    00123   OsiColCut & operator=( const OsiColCut& rhs);
    00124
    00126   OsiColCut ( const OsiColCut &);
    00127
    00129   OsiColCut ();
    00130
    00132   virtual OsiColCut * clone() const;
    00133
    00135   virtual ~OsiColCut ();
    00137
    00140
    00141   virtual void print() const;
    00143
    00144 private:
    00145
    00148
    00149   CoinPackedVector lbs_;
    00151   CoinPackedVector ubs_;
    00153
    00154 };
    00155
    00156
    00157
    00158 //-------------------------------------------------------------------
    00159 // Set lower & upper bound vectors
    00160 //-------------------------------------------------------------------
    00161 void OsiColCut::setLbs(
    00162                        int size,
    00163                        const int * colIndices,
    00164                        const double * lbElements )
    00165 {
    00166   lbs_.setVector(size,colIndices,lbElements);
    00167 }
    00168 //
    00169 void OsiColCut::setUbs(
    00170                        int size,
    00171                        const int * colIndices,
    00172                        const double * ubElements )
    00173 {
    00174   ubs_.setVector(size,colIndices,ubElements);
    00175 }
    00176 //
    00177 void OsiColCut::setLbs( const CoinPackedVector & lbs )
    00178 {
    00179   lbs_ = lbs;
    00180 }
    00181 //
    00182 void OsiColCut::setUbs( const CoinPackedVector & ubs )
    00183 {
    00184   ubs_ = ubs;
    00185 }
    00186
    00187 //-------------------------------------------------------------------
    00188 // Get Column Lower Bounds and Column Upper Bounds
    00189 //-------------------------------------------------------------------
    00190 const CoinPackedVector & OsiColCut::lbs() const
    00191 {
    00192   return lbs_;
    00193 }
    00194 //
    00195 const CoinPackedVector & OsiColCut::ubs() const
    00196 {
    00197   return ubs_;
    00198 }
    00199
    00200 //----------------------------------------------------------------
    00201 // == operator
    00202 //-------------------------------------------------------------------
    00203 bool
    00204 OsiColCut::operator==(
    00205                       const OsiColCut& rhs) const
    00206 {
    00207   if ( this->OsiCut::operator!=(rhs) )
    00208     return false;
    00209   if ( lbs() != rhs.lbs() )
    00210     return false;
    00211   if ( ubs() != rhs.ubs() )
    00212     return false;
    00213   return true;
    00214 }
    00215 //
    00216 bool
    00217 OsiColCut::operator!=(
    00218                       const OsiColCut& rhs) const
    00219 {
    00220   return !( (*this)==rhs );
    00221 }
    00222
    00223 //----------------------------------------------------------------
    00224 // consistent & infeasible
    00225 //-------------------------------------------------------------------
    00226 bool OsiColCut::consistent() const
    00227 {
    00228   const CoinPackedVector & lb = lbs();
    00229   const CoinPackedVector & ub = ubs();
    00230   // Test for consistent cut.
    00231   // Are packed vectors consistent?
    00232   lb.duplicateIndex("consistent", "OsiColCut");
    00233   ub.duplicateIndex("consistent", "OsiColCut");
    00234   if ( lb.getMinIndex() < 0 ) return false;
    00235   if ( ub.getMinIndex() < 0 ) return false;
    00236   return true;
    00237 }
    00238 //
    00239 bool OsiColCut::consistent(const OsiSolverInterface& im) const
    00240 {
    00241   const CoinPackedVector & lb = lbs();
    00242   const CoinPackedVector & ub = ubs();
    00243
    00244   // Test for consistent cut.
    00245   if ( lb.getMaxIndex() >= im.getNumCols() ) return false;
    00246   if ( ub.getMaxIndex() >= im.getNumCols() ) return false;
    00247
    00248   return true;
    00249 }
    00250
    00251 #if 0
    00252 bool OsiColCut::feasible(const OsiSolverInterface &im) const
    00253 {
    00254   const double * oldColLb = im.getColLower();
    00255   const double * oldColUb = im.getColUpper();
    00256   const CoinPackedVector & cutLbs = lbs();
    00257   const CoinPackedVector & cutUbs = ubs();
    00258   int i;
    00259
    00260   for ( i=0; i<cutLbs.size(); i++ ) {
    00261     int colIndx = cutLbs.indices()[i];
    00262     double newLb;
    00263     if ( cutLbs.elements()[i] > oldColLb[colIndx] )
    00264       newLb = cutLbs.elements()[i];
    00265     else
    00266       newLb = oldColLb[colIndx];
    00267
    00268     double newUb = oldColUb[colIndx];
    00269     if ( cutUbs.indexExists(colIndx) )
    00270       if ( cutUbs[colIndx] < newUb ) newUb = cutUbs[colIndx];
    00271       if ( newLb > newUb )
    00272         return false;
    00273   }
    00274
    00275   for ( i=0; i<cutUbs.size(); i++ ) {
    00276     int colIndx = cutUbs.indices()[i];
    00277     double newUb = cutUbs.elements()[i] < oldColUb[colIndx] ? cutUbs.elements()[i] : oldColUb[colIndx];
    00278     double newLb = oldColLb[colIndx];
    00279     if ( cutLbs.indexExists(colIndx) )
    00280       if ( cutLbs[colIndx] > newLb ) newLb = cutLbs[colIndx];
    00281       if ( newUb < newLb )
    00282         return false;
    00283   }
    00284
    00285   return true;
    00286 }
    00287 #endif
    00288
    00289
    00290 bool OsiColCut::infeasible(const OsiSolverInterface &im) const
    00291 {
    00292   const double * oldColLb = im.getColLower();
    00293   const double * oldColUb = im.getColUpper();
    00294   const CoinPackedVector & cutLbs = lbs();
    00295   const CoinPackedVector & cutUbs = ubs();
    00296   int i;
    00297
    00298   for ( i=0; i<cutLbs.getNumElements(); i++ ) {
    00299     int colIndx = cutLbs.getIndices()[i];
    00300     double newLb= cutLbs.getElements()[i] > oldColLb[colIndx] ?
    00301        cutLbs.getElements()[i] : oldColLb[colIndx];
    00302
    00303     double newUb = oldColUb[colIndx];
    00304     if ( cutUbs.isExistingIndex(colIndx) )
    00305       if ( cutUbs[colIndx] < newUb ) newUb = cutUbs[colIndx];
    00306       if ( newLb > newUb )
    00307         return true;
    00308   }
    00309
    00310   for ( i=0; i<cutUbs.getNumElements(); i++ ) {
    00311     int colIndx = cutUbs.getIndices()[i];
    00312     double newUb = cutUbs.getElements()[i] < oldColUb[colIndx] ?
    00313        cutUbs.getElements()[i] : oldColUb[colIndx];
    00314     double newLb = oldColLb[colIndx];
    00315     if ( cutLbs.isExistingIndex(colIndx) )
    00316       if ( cutLbs[colIndx] > newLb ) newLb = cutLbs[colIndx];
    00317       if ( newUb < newLb )
    00318         return true;
    00319   }
    00320
    00321   return false;
    00322 }
    00323
    00324 #endif