SPxEquiliSC Class Reference

Equilibrium row/column scaling.This SPxScaler implementation performs equilibrium scaling of the LPs rows and columns. More...

#include <spxequilisc.h>

Inheritance diagram for SPxEquiliSC:

Public Member Functions
Construction / destruction
	SPxEquiliSC (bool doBoth=true)
	default constructor (this scaler makes no use of inherited member m_colFirst)
	SPxEquiliSC (const SPxEquiliSC &old)
	copy constructor
SPxEquiliSC &	operator= (const SPxEquiliSC &)
	assignment operator
virtual	~SPxEquiliSC ()
	destructor
virtual SPxScaler *	clone () const
	clone function for polymorphism
Scaling
virtual void	scale (SPxLP &lp)
	Scale the loaded SPxLP.
Public Member Functions inherited from SPxScaler
	SPxScaler (const char *name, bool colFirst=false, bool doBoth=true, SPxOut *spxout=NULL)
	constructor
	SPxScaler (const SPxScaler &)
	copy constructor
SPxScaler &	operator= (const SPxScaler &)
	assignment operator
virtual	~SPxScaler ()
	destructor.
virtual const char *	getName () const
	get name of scaler.
virtual void	setOrder (bool colFirst)
	set scaling order.
virtual void	setBoth (bool both)
	set wether column and row scaling should be performed.
virtual void	setOutstream (SPxOut &newOutstream)
	set message handler
virtual void	unscalePrimal (Vector &x) const
	unscale dense primal solution vector given in x.
virtual void	unscaleSlacks (Vector &s) const
	unscale dense slack vector given in s.
virtual void	unscaleDual (Vector &pi) const
	unscale dense dual solution vector given in pi.
virtual void	unscaleRedCost (Vector &r) const
	unscale dense reduced cost vector given in r.
virtual Real	minAbsColscale () const
	absolute smallest column scaling factor
virtual Real	maxAbsColscale () const
	absolute biggest column scaling factor
virtual Real	minAbsRowscale () const
	absolute smallest row scaling factor
virtual Real	maxAbsRowscale () const
	absolute biggest row scaling factor
virtual Real	maxColRatio (const SPxLP &lp) const
	maximum ratio between absolute biggest and smallest element in any column.
virtual Real	maxRowRatio (const SPxLP &lp) const
	maximum ratio between absolute biggest and smallest element in any row.
virtual bool	isConsistent () const
	consistency check

Protected Member Functions
Protected helpers
virtual Real	computeScale (Real, Real maxi) const
	Does nothing but returning maxi.
Protected Member Functions inherited from SPxScaler
virtual void	setup (SPxLP &lp)
	setup scale array for the LP.
virtual Real	computeScalingVecs (const SVSet *vecset, const DataArray< Real > &coScaleval, DataArray< Real > &scaleval)
	iterates through vecset and calls computeScale() for each vector.
virtual void	applyScaling (SPxLP &lp)
	applies m_colscale and m_rowscale to the lp.

Additional Inherited Members
Protected Attributes inherited from SPxScaler
const char *	m_name
	Name of the scaler.
DataArray< Real >	m_colscale
	column scaling factors
DataArray< Real >	m_rowscale
	row scaling factors
bool	m_colFirst
	do column scaling first
bool	m_doBoth
	do columns and rows
SPxOut *	spxout
	message handler

Detailed Description

Equilibrium row/column scaling.

This SPxScaler implementation performs equilibrium scaling of the LPs rows and columns.

Definition at line 35 of file spxequilisc.h.

Constructor & Destructor Documentation

SPxEquiliSC ( bool  doBoth = true )

explicit

default constructor (this scaler makes no use of inherited member m_colFirst)

Definition at line 31 of file spxequilisc.cpp.

Referenced by SPxEquiliSC::clone().

SPxEquiliSC

(

const SPxEquiliSC &

old

)

copy constructor

Definition at line 35 of file spxequilisc.cpp.

virtual ~SPxEquiliSC ( )

virtual

destructor

Definition at line 49 of file spxequilisc.h.

Member Function Documentation

virtual SPxScaler* clone ( ) const

virtual

clone function for polymorphism

Implements SPxScaler.

Definition at line 52 of file spxequilisc.h.

References SPxEquiliSC::SPxEquiliSC().

Real computeScale ( Real  , Real  maxi  ) const

protectedvirtual

Does nothing but returning maxi.

Reimplemented from SPxScaler.

Definition at line 49 of file spxequilisc.cpp.

SPxEquiliSC & operator=

(

const SPxEquiliSC &

rhs

)

assignment operator

Definition at line 39 of file spxequilisc.cpp.

References SPxScaler::operator=().

void scale ( SPxLP &  lp )

virtual

Scale the loaded SPxLP.

Implements SPxScaler.

Definition at line 55 of file spxequilisc.cpp.

References SPxScaler::applyScaling(), LPColSetBase< R >::colSet(), SPxScaler::computeScalingVecs(), SPxScaler::m_colscale, SPxScaler::m_doBoth, SPxScaler::m_rowscale, SPxScaler::maxAbsColscale(), SPxLPBase< R >::maxAbsNzo(), SPxScaler::maxAbsRowscale(), SPxScaler::maxColRatio(), SPxScaler::maxRowRatio(), SPxScaler::minAbsColscale(), SPxLPBase< R >::minAbsNzo(), SPxScaler::minAbsRowscale(), MSG_INFO1, MSG_INFO2, MSG_INFO3, LPRowSetBase< R >::rowSet(), SPxScaler::setup(), and SPxScaler::spxout.