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# /home/coin/svn-release/Alps-1.4.8/CoinUtils/src/CoinPresolveFixed.hpp

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    00001 /* $Id: CoinPresolveFixed.hpp 1510 2011-12-08 23:56:01Z lou $ */
    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 CoinPresolveFixed_H
    00007 #define CoinPresolveFixed_H
    00008 #define FIXED_VARIABLE  1
    00009
    00025 class remove_fixed_action : public CoinPresolveAction {
    00026  public:
    00030   struct action {
    00031     int col;
    00032     int start;
    00033     double sol;
    00034   };
    00036   int *colrows_;
    00038   double *colels_;
    00040   int nactions_;
    00042   action *actions_;
    00043
    00044  private:
    00046   remove_fixed_action(int nactions,
    00047                       action *actions,
    00048                       double * colels,
    00049                       int * colrows,
    00050                       const CoinPresolveAction *next);
    00051
    00052  public:
    00054   const char *name() const;
    00055
    00063   static const remove_fixed_action *presolve(CoinPresolveMatrix *prob,
    00064                                          int *fcols,
    00065                                          int nfcols,
    00066                                          const CoinPresolveAction *next);
    00067
    00068   void postsolve(CoinPostsolveMatrix *prob) const;
    00069
    00071   virtual ~remove_fixed_action();
    00072 };
    00073
    00074
    00082 const CoinPresolveAction *remove_fixed(CoinPresolveMatrix *prob,
    00083                                     const CoinPresolveAction *next);
    00084
    00085
    00095 class make_fixed_action : public CoinPresolveAction {
    00096
    00098   struct action {
    00099     double bound;
    00100     int col ;
    00101   };
    00102
    00104   int nactions_;
    00106   const action *actions_;
    00107
    00112   const bool fix_to_lower_;
    00113
    00117   const remove_fixed_action *faction_;
    00118
    00120   make_fixed_action(int nactions, const action *actions, bool fix_to_lower,
    00121                     const remove_fixed_action *faction,
    00122                     const CoinPresolveAction *next)
    00123     : CoinPresolveAction(next),
    00124       nactions_(nactions), actions_(actions),
    00125       fix_to_lower_(fix_to_lower),
    00126       faction_(faction)
    00127   {}
    00128
    00129  public:
    00131   const char *name() const;
    00132
    00140   static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
    00141                                          int *fcols,
    00142                                          int nfcols,
    00143                                          bool fix_to_lower,
    00144                                          const CoinPresolveAction *next);
    00145
    00150   void postsolve(CoinPostsolveMatrix *prob) const;
    00151
    00153   virtual ~make_fixed_action() {
    00154     deleteAction(actions_,action*);
    00155     delete faction_;
    00156   }
    00157 };
    00158
    00166 const CoinPresolveAction *make_fixed(CoinPresolveMatrix *prob,
    00167                                     const CoinPresolveAction *next) ;
    00168
    00180 void transferCosts(CoinPresolveMatrix * prob);
    00181 #endif