/home/coin/SVN-release/Alps-1.2.2/Cgl/src/CglLandP/CglLandPUtils.hpp

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00001 // Copyright (C) 2005-2009, Pierre Bonami and others.  All Rights Reserved.
00002 // Author:   Pierre Bonami
00003 //           LIF
00004 //           CNRS, Aix-Marseille Universites
00005 // Date:     02/23/08
00006 //---------------------------------------------------------------------------
00007 
00008 #ifndef CglLandPUtils_H
00009 #define CglLandPUtils_H
00010 #include "CglLandPTabRow.hpp"
00011 
00012 class OsiRowCut;
00013 class OsiCuts;
00014 #include <vector>
00015 
00016 namespace LAP
00017 {
00019 double normCoef(TabRow &row, int ncols, const int * nonBasics);
00021 void scale(OsiRowCut &cut);
00023 void scale(OsiRowCut &cut, double norma);
00025 void modularizeRow(TabRow & row, const bool * integerVar);
00026 
00027 
00029 inline double intersectionCutCoef(double alpha_i, double beta)
00030 {
00031     if (alpha_i>0) return alpha_i* (1 - beta);
00032     else return -alpha_i * beta;// (1 - beta);
00033 }
00034 
00036 inline double modularizedCoef(double alpha, double beta)
00037 {
00038     double f_i = alpha - floor(alpha);
00039     if (f_i <= beta)
00040         return f_i;
00041     else
00042         return f_i - 1;
00043 }
00044 
00046 inline bool int_val(double value, double tol)
00047 {
00048     return fabs( floor( value + 0.5 ) - value ) < tol;
00049 }
00050 
00051 
00053 struct Cuts
00054 {
00055     Cuts():  numberCuts_(0), cuts_(0)
00056     {
00057     }
00059     int insertAll(OsiCuts & cs, CoinRelFltEq eq);
00061     ~Cuts() {}
00063     OsiRowCut * rowCut(unsigned int i)
00064     {
00065         return cuts_[i];
00066     }
00068     const OsiRowCut * rowCut(unsigned int i) const
00069     {
00070         return cuts_[i];
00071     }
00073     void insert(int i, OsiRowCut * cut);
00075     int numberCuts()
00076     {
00077         return numberCuts_;
00078     }
00080     void resize(unsigned int i)
00081     {
00082         cuts_.resize(i, reinterpret_cast<OsiRowCut *> (NULL));
00083     }
00084 private:
00086     int numberCuts_;
00088     std::vector<OsiRowCut *> cuts_;
00089 };
00090 
00091 }
00092 #endif
00093 

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