Cbc
2.9.9

This is the Clp interface to CoinPresolve. More...
#include <ClpPresolve.hpp>
Public Member Functions  
Main Constructor, destructor  
ClpPresolve ()  
Default constructor. More...  
virtual  ~ClpPresolve () 
Virtual destructor. More...  
presolve  presolves a model, transforming the model  
and saving information in the ClpPresolve object needed for postsolving. This underlying (protected) method is virtual; the idea is that in the future, one could override this method to customize how the various presolve techniques are applied. This version of presolve returns a pointer to a new presolved model. NULL if infeasible or unbounded. This should be paired with postsolve below. The advantage of going back to original model is that it will be exactly as it was i.e. 0.0 will not become 1.0e19. If keepIntegers is true then bounds may be tightened in original. Bounds will be moved by up to feasibilityTolerance to try and stay feasible. Names will be dropped in presolved model if asked  
ClpSimplex *  presolvedModel (ClpSimplex &si, double feasibilityTolerance=0.0, bool keepIntegers=true, int numberPasses=5, bool dropNames=false, bool doRowObjective=false, const char *prohibitedRows=NULL, const char *prohibitedColumns=NULL) 
int  presolvedModelToFile (ClpSimplex &si, std::string fileName, double feasibilityTolerance=0.0, bool keepIntegers=true, int numberPasses=5, bool dropNames=false, bool doRowObjective=false) 
This version saves data in a file. More...  
ClpSimplex *  model () const 
Return pointer to presolved model, Up to user to destroy. More...  
ClpSimplex *  originalModel () const 
Return pointer to original model. More...  
void  setOriginalModel (ClpSimplex *model) 
Set pointer to original model. More...  
const int *  originalColumns () const 
return pointer to original columns More...  
const int *  originalRows () const 
return pointer to original rows More...  
void  setNonLinearValue (double value) 
"Magic" number. More...  
double  nonLinearValue () const 
bool  doDual () const 
Whether we want to do dual part of presolve. More...  
void  setDoDual (bool doDual) 
bool  doSingleton () const 
Whether we want to do singleton part of presolve. More...  
void  setDoSingleton (bool doSingleton) 
bool  doDoubleton () const 
Whether we want to do doubleton part of presolve. More...  
void  setDoDoubleton (bool doDoubleton) 
bool  doTripleton () const 
Whether we want to do tripleton part of presolve. More...  
void  setDoTripleton (bool doTripleton) 
bool  doTighten () const 
Whether we want to do tighten part of presolve. More...  
void  setDoTighten (bool doTighten) 
bool  doForcing () const 
Whether we want to do forcing part of presolve. More...  
void  setDoForcing (bool doForcing) 
bool  doImpliedFree () const 
Whether we want to do impliedfree part of presolve. More...  
void  setDoImpliedFree (bool doImpliedfree) 
bool  doDupcol () const 
Whether we want to do dupcol part of presolve. More...  
void  setDoDupcol (bool doDupcol) 
bool  doDuprow () const 
Whether we want to do duprow part of presolve. More...  
void  setDoDuprow (bool doDuprow) 
bool  doDependency () const 
Whether we want to do dependency part of presolve. More...  
void  setDoDependency (bool doDependency) 
bool  doSingletonColumn () const 
Whether we want to do singleton column part of presolve. More...  
void  setDoSingletonColumn (bool doSingleton) 
bool  doGubrow () const 
Whether we want to do gubrow part of presolve. More...  
void  setDoGubrow (bool doGubrow) 
bool  doTwoxTwo () const 
Whether we want to do twoxtwo part of presolve. More...  
void  setDoTwoxtwo (bool doTwoxTwo) 
bool  doIntersection () const 
Whether we want to allow duplicate intersections. More...  
void  setDoIntersection (bool doIntersection) 
int  zeroSmall () const 
How much we want to zero small values from aggregation  ratio 0  1.0e12, 1 1.0e11, 2 1.0e10, 3 1.0e9. More...  
void  setZeroSmall (int value) 
int  presolveActions () const 
Set whole group. More...  
void  setPresolveActions (int action) 
void  setSubstitution (int value) 
Substitution level. More...  
void  statistics () 
Asks for statistics. More...  
int  presolveStatus () const 
Return presolve status (0,1,2) More...  
postsolve  postsolve the problem. If the problem  
has not been solved to optimality, there are no guarantees. If you are using an algorithm like simplex that has a concept of "basic" rows/cols, then set updateStatus Note that if you modified the original problem after presolving, then you must ``undo'' these modifications before calling postsolve. This version updates original  
virtual void  postsolve (bool updateStatus=true) 
void  destroyPresolve () 
Gets rid of presolve actions (e.g.when infeasible) More...  
private or protected data  
ClpSimplex *  originalModel_ 
Original model  must not be destroyed before postsolve. More...  
ClpSimplex *  presolvedModel_ 
ClpPresolved model  up to user to destroy by deleteClpPresolvedModel. More...  
double  nonLinearValue_ 
"Magic" number. More...  
int *  originalColumn_ 
Original column numbers. More...  
int *  originalRow_ 
Original row numbers. More...  
double *  rowObjective_ 
Row objective. More...  
const CoinPresolveAction *  paction_ 
The list of transformations applied. More...  
int  ncols_ 
The postsolved problem will expand back to its former size as postsolve transformations are applied. More...  
int  nrows_ 
CoinBigIndex  nelems_ 
int  numberPasses_ 
Number of major passes. More...  
int  substitution_ 
Substitution level. More...  
std::string  saveFile_ 
Name of saved model file. More...  
int  presolveActions_ 
Whether we want to skip dual part of presolve etc. More...  
virtual const CoinPresolveAction *  presolve (CoinPresolveMatrix *prob) 
If you want to apply the individual presolve routines differently, or perhaps add your own to the mix, define a derived class and override this method. More...  
virtual void  postsolve (CoinPostsolveMatrix &prob) 
Postsolving is pretty generic; just apply the transformations in reverse order. More...  
virtual ClpSimplex *  gutsOfPresolvedModel (ClpSimplex *originalModel, double feasibilityTolerance, bool keepIntegers, int numberPasses, bool dropNames, bool doRowObjective, const char *prohibitedRows=NULL, const char *prohibitedColumns=NULL) 
This is main part of Presolve. More...  
This is the Clp interface to CoinPresolve.
Definition at line 15 of file ClpPresolve.hpp.
ClpPresolve::ClpPresolve  (  ) 
Default constructor.

virtual 
Virtual destructor.
ClpSimplex* ClpPresolve::presolvedModel  (  ClpSimplex &  si, 
double  feasibilityTolerance = 0.0 , 

bool  keepIntegers = true , 

int  numberPasses = 5 , 

bool  dropNames = false , 

bool  doRowObjective = false , 

const char *  prohibitedRows = NULL , 

const char *  prohibitedColumns = NULL 

) 
int ClpPresolve::presolvedModelToFile  (  ClpSimplex &  si, 
std::string  fileName,  
double  feasibilityTolerance = 0.0 , 

bool  keepIntegers = true , 

int  numberPasses = 5 , 

bool  dropNames = false , 

bool  doRowObjective = false 

) 
This version saves data in a file.
The passed in model is updated to be presolved model. Returns nonzero if infeasible
ClpSimplex* ClpPresolve::model  (  )  const 
Return pointer to presolved model, Up to user to destroy.
ClpSimplex* ClpPresolve::originalModel  (  )  const 
Return pointer to original model.
void ClpPresolve::setOriginalModel  (  ClpSimplex *  model  ) 
Set pointer to original model.
const int* ClpPresolve::originalColumns  (  )  const 
return pointer to original columns
const int* ClpPresolve::originalRows  (  )  const 
return pointer to original rows

inline 
"Magic" number.
If this is nonzero then any elements with this value may change and so presolve is very limited in what can be done to the row and column. This is for nonlinear problems.
Definition at line 76 of file ClpPresolve.hpp.

inline 
Definition at line 79 of file ClpPresolve.hpp.

inline 
Whether we want to do dual part of presolve.
Definition at line 83 of file ClpPresolve.hpp.

inline 
Definition at line 86 of file ClpPresolve.hpp.

inline 
Whether we want to do singleton part of presolve.
Definition at line 91 of file ClpPresolve.hpp.

inline 
Definition at line 94 of file ClpPresolve.hpp.

inline 
Whether we want to do doubleton part of presolve.
Definition at line 99 of file ClpPresolve.hpp.

inline 
Definition at line 102 of file ClpPresolve.hpp.

inline 
Whether we want to do tripleton part of presolve.
Definition at line 107 of file ClpPresolve.hpp.

inline 
Definition at line 110 of file ClpPresolve.hpp.

inline 
Whether we want to do tighten part of presolve.
Definition at line 115 of file ClpPresolve.hpp.

inline 
Definition at line 118 of file ClpPresolve.hpp.

inline 
Whether we want to do forcing part of presolve.
Definition at line 123 of file ClpPresolve.hpp.

inline 
Definition at line 126 of file ClpPresolve.hpp.

inline 
Whether we want to do impliedfree part of presolve.
Definition at line 131 of file ClpPresolve.hpp.

inline 
Definition at line 134 of file ClpPresolve.hpp.

inline 
Whether we want to do dupcol part of presolve.
Definition at line 139 of file ClpPresolve.hpp.

inline 
Definition at line 142 of file ClpPresolve.hpp.

inline 
Whether we want to do duprow part of presolve.
Definition at line 147 of file ClpPresolve.hpp.

inline 
Definition at line 150 of file ClpPresolve.hpp.

inline 
Whether we want to do dependency part of presolve.
Definition at line 155 of file ClpPresolve.hpp.

inline 
Definition at line 158 of file ClpPresolve.hpp.

inline 
Whether we want to do singleton column part of presolve.
Definition at line 163 of file ClpPresolve.hpp.

inline 
Definition at line 166 of file ClpPresolve.hpp.

inline 
Whether we want to do gubrow part of presolve.
Definition at line 171 of file ClpPresolve.hpp.

inline 
Definition at line 174 of file ClpPresolve.hpp.

inline 
Whether we want to do twoxtwo part of presolve.
Definition at line 179 of file ClpPresolve.hpp.

inline 
Definition at line 182 of file ClpPresolve.hpp.

inline 
Whether we want to allow duplicate intersections.
Definition at line 187 of file ClpPresolve.hpp.

inline 
Definition at line 190 of file ClpPresolve.hpp.

inline 
How much we want to zero small values from aggregation  ratio 0  1.0e12, 1 1.0e11, 2 1.0e10, 3 1.0e9.
Definition at line 196 of file ClpPresolve.hpp.

inline 
Definition at line 199 of file ClpPresolve.hpp.

inline 
Set whole group.
Definition at line 204 of file ClpPresolve.hpp.

inline 
Definition at line 207 of file ClpPresolve.hpp.

inline 
Substitution level.
Definition at line 211 of file ClpPresolve.hpp.

inline 
Asks for statistics.
Definition at line 215 of file ClpPresolve.hpp.
int ClpPresolve::presolveStatus  (  )  const 
Return presolve status (0,1,2)

virtual 
void ClpPresolve::destroyPresolve  (  ) 
Gets rid of presolve actions (e.g.when infeasible)

protectedvirtual 
If you want to apply the individual presolve routines differently, or perhaps add your own to the mix, define a derived class and override this method.

protectedvirtual 
Postsolving is pretty generic; just apply the transformations in reverse order.
You will probably only be interested in overriding this method if you want to add code to test for consistency while debugging new presolve techniques.

protectedvirtual 
This is main part of Presolve.

private 
Original model  must not be destroyed before postsolve.
Definition at line 237 of file ClpPresolve.hpp.

private 
ClpPresolved model  up to user to destroy by deleteClpPresolvedModel.
Definition at line 240 of file ClpPresolve.hpp.

private 
"Magic" number.
If this is nonzero then any elements with this value may change and so presolve is very limited in what can be done to the row and column. This is for nonlinear problems. One could also allow for cases where sign of coefficient is known.
Definition at line 246 of file ClpPresolve.hpp.

private 
Original column numbers.
Definition at line 248 of file ClpPresolve.hpp.

private 
Original row numbers.
Definition at line 250 of file ClpPresolve.hpp.

private 
Row objective.
Definition at line 252 of file ClpPresolve.hpp.

private 
The list of transformations applied.
Definition at line 254 of file ClpPresolve.hpp.

private 
The postsolved problem will expand back to its former size as postsolve transformations are applied.
It is efficient to allocate data structures for the final size of the problem rather than expand them as needed. These fields give the size of the original problem.
Definition at line 261 of file ClpPresolve.hpp.

private 
Definition at line 262 of file ClpPresolve.hpp.

private 
Definition at line 263 of file ClpPresolve.hpp.

private 
Number of major passes.
Definition at line 265 of file ClpPresolve.hpp.

private 
Substitution level.
Definition at line 267 of file ClpPresolve.hpp.

private 
Name of saved model file.
Definition at line 270 of file ClpPresolve.hpp.

private 
Whether we want to skip dual part of presolve etc.
512 bit allows duplicate column processing on integer columns and dual stuff on integers
Definition at line 276 of file ClpPresolve.hpp.