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CoinPresolveMonitor Class Reference

Monitor a row or column for modification. More...

#include <CoinPresolveMonitor.hpp>

+ Collaboration diagram for CoinPresolveMonitor:

Public Member Functions

 CoinPresolveMonitor ()
 Default constructor. More...
 
 CoinPresolveMonitor (const CoinPresolveMatrix *mtx, bool isRow, int k)
 Initialise from a CoinPresolveMatrix. More...
 
 CoinPresolveMonitor (const CoinPostsolveMatrix *mtx, bool isRow, int k)
 Initialise from a CoinPostsolveMatrix. More...
 
void checkAndTell (const CoinPresolveMatrix *mtx)
 Compare the present row or column against the stored copy and report differences. More...
 
void checkAndTell (const CoinPostsolveMatrix *mtx)
 Compare the present row or column against the stored copy and report differences. More...
 

Private Member Functions

CoinPackedVectorextractRow (int i, const CoinPresolveMatrix *mtx) const
 Extract a row from a CoinPresolveMatrix. More...
 
CoinPackedVectorextractCol (int j, const CoinPresolveMatrix *mtx) const
 Extract a column from a CoinPresolveMatrix. More...
 
CoinPackedVectorextractRow (int i, const CoinPostsolveMatrix *mtx) const
 Extract a row from a CoinPostsolveMatrix. More...
 
CoinPackedVectorextractCol (int j, const CoinPostsolveMatrix *mtx) const
 Extract a column from a CoinPostsolveMatrix. More...
 
void checkAndTell (CoinPackedVector *curVec, double lb, double ub)
 Worker method underlying the public checkAndTell methods. More...
 

Private Attributes

bool isRow_
 True to monitor a row, false to monitor a column. More...
 
int ndx_
 Row or column index. More...
 
CoinPackedVectororigVec_
 The original row or column. More...
 
double lb_
 Original row or column lower bound. More...
 
double ub_
 Original row or column upper bound. More...
 

Detailed Description

Monitor a row or column for modification.

The purpose of this class is to monitor a row or column for modifications during presolve and postsolve. Each object can monitor one row or column. The initial copy of the row or column is loaded by the constructor. Each subsequent call to checkAndTell() compares the current state of the row or column with the stored state and reports any modifications.

Internally the row or column is held as a CoinPackedVector so that it's possible to follow a row or column through presolve (CoinPresolveMatrix) and postsolve (CoinPostsolveMatrix).

Do not underestimate the amount of work required here. Extracting a row from the CoinPostsolve matrix requires a scan of every element in the matrix. That's one scan by the constructor and one scan with every call to modify. But that's precisely why it's virtually impossible to debug presolve without aids.

Parameter overloads for CoinPresolveMatrix and CoinPostsolveMatrix are a little clumsy, but not a problem in use. The alternative is to add methods to the CoinPresolveMatrix and CoinPostsolveMatrix classes that will only be used for debugging. That's not too attractive either.

Definition at line 29 of file CoinPresolveMonitor.hpp.

Constructor & Destructor Documentation

CoinPresolveMonitor::CoinPresolveMonitor ( )

Default constructor.

Creates an empty monitor.

CoinPresolveMonitor::CoinPresolveMonitor ( const CoinPresolveMatrix mtx,
bool  isRow,
int  k 
)

Initialise from a CoinPresolveMatrix.

Load the initial row or column from a CoinPresolveMatrix. Set isRow true for a row, false for a column.

CoinPresolveMonitor::CoinPresolveMonitor ( const CoinPostsolveMatrix mtx,
bool  isRow,
int  k 
)

Initialise from a CoinPostsolveMatrix.

Load the initial row or column from a CoinPostsolveMatrix. Set isRow true for a row, false for a column.

Member Function Documentation

void CoinPresolveMonitor::checkAndTell ( const CoinPresolveMatrix mtx)

Compare the present row or column against the stored copy and report differences.

Load the current row or column from a CoinPresolveMatrix and compare. Differences are printed to std::cout.

void CoinPresolveMonitor::checkAndTell ( const CoinPostsolveMatrix mtx)

Compare the present row or column against the stored copy and report differences.

Load the current row or column from a CoinPostsolveMatrix and compare. Differences are printed to std::cout.

CoinPackedVector* CoinPresolveMonitor::extractRow ( int  i,
const CoinPresolveMatrix mtx 
) const
private

Extract a row from a CoinPresolveMatrix.

CoinPackedVector* CoinPresolveMonitor::extractCol ( int  j,
const CoinPresolveMatrix mtx 
) const
private

Extract a column from a CoinPresolveMatrix.

CoinPackedVector* CoinPresolveMonitor::extractRow ( int  i,
const CoinPostsolveMatrix mtx 
) const
private

Extract a row from a CoinPostsolveMatrix.

CoinPackedVector* CoinPresolveMonitor::extractCol ( int  j,
const CoinPostsolveMatrix mtx 
) const
private

Extract a column from a CoinPostsolveMatrix.

void CoinPresolveMonitor::checkAndTell ( CoinPackedVector curVec,
double  lb,
double  ub 
)
private

Worker method underlying the public checkAndTell methods.

Member Data Documentation

bool CoinPresolveMonitor::isRow_
private

True to monitor a row, false to monitor a column.

Definition at line 87 of file CoinPresolveMonitor.hpp.

int CoinPresolveMonitor::ndx_
private

Row or column index.

Definition at line 90 of file CoinPresolveMonitor.hpp.

CoinPackedVector* CoinPresolveMonitor::origVec_
private

The original row or column.

Sorted in increasing order of indices.

Definition at line 96 of file CoinPresolveMonitor.hpp.

double CoinPresolveMonitor::lb_
private

Original row or column lower bound.

Definition at line 99 of file CoinPresolveMonitor.hpp.

double CoinPresolveMonitor::ub_
private

Original row or column upper bound.

Definition at line 102 of file CoinPresolveMonitor.hpp.


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