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CglDuplicateRow Class Reference

DuplicateRow Cut Generator Class. More...

#include <CglDuplicateRow.hpp>

+ Inheritance diagram for CglDuplicateRow:
+ Collaboration diagram for CglDuplicateRow:

List of all members.

Public Member Functions

Get information on size of problem
const int * duplicate () const
 Get duplicate row list, -1 means still in, -2 means out (all fixed), k>= means same as row k.
int sizeDynamic () const
 Size of dynamic program.
int numberOriginalRows () const
 Number of rows in original problem.
int logLevel () const
 logLevel
void setLogLevel (int value)
We only check for duplicates amongst rows with effective rhs <= this
int maximumRhs () const
 Get.
void setMaximumRhs (int value)
 Set.
We only check for dominated amongst groups of columns whose size <= this
int maximumDominated () const
 Get.
void setMaximumDominated (int value)
 Set.
gets and sets
int mode () const
 Get mode.
void setMode (int value)
 Set mode.
Constructors and destructors
 CglDuplicateRow ()
 Default constructor.
 CglDuplicateRow (OsiSolverInterface *solver)
 Useful constructor.
 CglDuplicateRow (const CglDuplicateRow &rhs)
 Copy constructor.
virtual CglCutGeneratorclone () const
 Clone.
CglDuplicateRowoperator= (const CglDuplicateRow &rhs)
 Assignment operator.
virtual ~CglDuplicateRow ()
 Destructor.
virtual std::string generateCpp (FILE *fp)
 Create C++ lines to get to current state.
virtual void refreshSolver (OsiSolverInterface *solver)
 This can be used to refresh any information.

Protected Attributes

Protected member data
CoinPackedMatrix matrix_
 Matrix.
CoinPackedMatrix matrixByRow_
 Matrix by row.
int * rhs_
 Possible rhs (if 0 then not possible)
int * duplicate_
 Marks duplicate rows.
int * lower_
 To allow for <= rows.
CglStoredstoredCuts_
 Stored cuts if we found dominance cuts.
int maximumDominated_
 Check dominated columns if less than this number of candidates.
int maximumRhs_
 Check duplicates if effective rhs <= this.
int sizeDynamic_
 Size of dynamic program.
int mode_
 1 do rows, 2 do columns, 3 do both
int logLevel_
 Controls print out.

Generate Cuts

virtual void generateCuts (const OsiSolverInterface &si, OsiCuts &cs, const CglTreeInfo info=CglTreeInfo()) const
 Fix variables and find duplicate/dominated rows for the model of the solver interface, si.
CglStoredoutDuplicates (OsiSolverInterface *solver)
 Fix variables and find duplicate/dominated rows for the model of the solver interface, si.

Detailed Description

DuplicateRow Cut Generator Class.

Definition at line 15 of file CglDuplicateRow.hpp.


Constructor & Destructor Documentation

Default constructor.

CglDuplicateRow::CglDuplicateRow ( OsiSolverInterface *  solver)

Useful constructor.

Copy constructor.

virtual CglDuplicateRow::~CglDuplicateRow ( ) [virtual]

Destructor.


Member Function Documentation

virtual void CglDuplicateRow::generateCuts ( const OsiSolverInterface &  si,
OsiCuts &  cs,
const CglTreeInfo  info = CglTreeInfo() 
) const [virtual]

Fix variables and find duplicate/dominated rows for the model of the solver interface, si.

This is a very simple minded idea but I (JJF) am using it in a project so thought I might as well add it. It should really be called before first solve and I may modify CBC to allow for that.

This is designed for problems with few rows and many integer variables where the rhs are <= or == and all coefficients and rhs are small integers.

If effective rhs is K then we can fix all variables with coefficients > K to their lower bounds (effective rhs just means original with variables with nonzero lower bounds subtracted out).

If one row is a subset of another and the effective rhs are same we can fix some variables and then the two rows are identical.

The generator marks identical rows so can be taken out in solve

Implements CglCutGenerator.

CglStored* CglDuplicateRow::outDuplicates ( OsiSolverInterface *  solver)

Fix variables and find duplicate/dominated rows for the model of the solver interface, si.

This is a very simple minded idea but I (JJF) am using it in a project so thought I might as well add it. It should really be called before first solve and I may modify CBC to allow for that.

This is designed for problems with few rows and many integer variables where the rhs are <= or == and all coefficients and rhs are small integers.

If effective rhs is K then we can fix all variables with coefficients > K to their lower bounds (effective rhs just means original with variables with nonzero lower bounds subtracted out).

If one row is a subset of another and the effective rhs are same we can fix some variables and then the two rows are identical.

This version does deletions and fixings and may return stored cuts for dominated columns

const int* CglDuplicateRow::duplicate ( ) const [inline]

Get duplicate row list, -1 means still in, -2 means out (all fixed), k>= means same as row k.

Definition at line 79 of file CglDuplicateRow.hpp.

int CglDuplicateRow::sizeDynamic ( ) const [inline]

Size of dynamic program.

Definition at line 82 of file CglDuplicateRow.hpp.

int CglDuplicateRow::numberOriginalRows ( ) const [inline]

Number of rows in original problem.

Definition at line 85 of file CglDuplicateRow.hpp.

int CglDuplicateRow::logLevel ( ) const [inline]

logLevel

Definition at line 92 of file CglDuplicateRow.hpp.

void CglDuplicateRow::setLogLevel ( int  value) [inline]

Definition at line 94 of file CglDuplicateRow.hpp.

int CglDuplicateRow::maximumRhs ( ) const [inline]

Get.

Definition at line 102 of file CglDuplicateRow.hpp.

void CglDuplicateRow::setMaximumRhs ( int  value) [inline]

Set.

Definition at line 105 of file CglDuplicateRow.hpp.

int CglDuplicateRow::maximumDominated ( ) const [inline]

Get.

Definition at line 112 of file CglDuplicateRow.hpp.

void CglDuplicateRow::setMaximumDominated ( int  value) [inline]

Set.

Definition at line 115 of file CglDuplicateRow.hpp.

int CglDuplicateRow::mode ( ) const [inline]

Get mode.

Definition at line 121 of file CglDuplicateRow.hpp.

void CglDuplicateRow::setMode ( int  value) [inline]

Set mode.

Definition at line 124 of file CglDuplicateRow.hpp.

virtual CglCutGenerator* CglDuplicateRow::clone ( ) const [virtual]

Clone.

Implements CglCutGenerator.

CglDuplicateRow& CglDuplicateRow::operator= ( const CglDuplicateRow rhs)

Assignment operator.

virtual std::string CglDuplicateRow::generateCpp ( FILE *  fp) [virtual]

Create C++ lines to get to current state.

Reimplemented from CglCutGenerator.

virtual void CglDuplicateRow::refreshSolver ( OsiSolverInterface *  solver) [virtual]

This can be used to refresh any information.

Reimplemented from CglCutGenerator.


Member Data Documentation

CoinPackedMatrix CglDuplicateRow::matrix_ [protected]

Matrix.

Definition at line 166 of file CglDuplicateRow.hpp.

CoinPackedMatrix CglDuplicateRow::matrixByRow_ [protected]

Matrix by row.

Definition at line 168 of file CglDuplicateRow.hpp.

int* CglDuplicateRow::rhs_ [protected]

Possible rhs (if 0 then not possible)

Definition at line 170 of file CglDuplicateRow.hpp.

int* CglDuplicateRow::duplicate_ [mutable, protected]

Marks duplicate rows.

Definition at line 172 of file CglDuplicateRow.hpp.

int* CglDuplicateRow::lower_ [protected]

To allow for <= rows.

Definition at line 174 of file CglDuplicateRow.hpp.

CglStored* CglDuplicateRow::storedCuts_ [mutable, protected]

Stored cuts if we found dominance cuts.

Definition at line 176 of file CglDuplicateRow.hpp.

Check dominated columns if less than this number of candidates.

Definition at line 178 of file CglDuplicateRow.hpp.

Check duplicates if effective rhs <= this.

Definition at line 180 of file CglDuplicateRow.hpp.

int CglDuplicateRow::sizeDynamic_ [mutable, protected]

Size of dynamic program.

Definition at line 182 of file CglDuplicateRow.hpp.

int CglDuplicateRow::mode_ [protected]

1 do rows, 2 do columns, 3 do both

Definition at line 184 of file CglDuplicateRow.hpp.

int CglDuplicateRow::logLevel_ [protected]

Controls print out.

Definition at line 186 of file CglDuplicateRow.hpp.


The documentation for this class was generated from the following file:
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