Solution vector based start basis.This version of SPxWeightST can be used to construct a starting basis for an LP to be solved with SoPlex if an approximate solution vector or dual vector (possibly optained by a heuristic) is available. This is done by setting up weights for the SPxWeightST it is derived from. More...

#include <spxvectorst.h>

Public Member Functions
Construction / destruction
	SPxVectorST ()
	default constructor. More...

	SPxVectorST (const SPxVectorST &old)
	copy constructor More...

SPxVectorST &	operator= (const SPxVectorST &rhs)
	assignment operator More...

virtual	~SPxVectorST ()
	destructor. More...

virtual SPxStarter< R > *	clone () const
	clone function for polymorphism More...

Modification
void	primal (const VectorBase< R > &v)
	sets up primal solution vector. More...

void	dual (const VectorBase< R > &v)
	sets up primal solution vector. More...

Public Member Functions inherited from SPxWeightST< R >
	SPxWeightST ()
	default constructor. More...

	SPxWeightST (const SPxWeightST &old)
	copy constructor More...

SPxWeightST &	operator= (const SPxWeightST &rhs)
	assignment operator More...

virtual	~SPxWeightST ()
	destructor. More...

void	generate (SPxSolverBase< R > &base)
	generates start basis for loaded basis. More...

virtual bool	isConsistent () const
	consistency check. More...

Public Member Functions inherited from SPxStarter< R >
virtual void	setTolerances (const std::shared_ptr< Tolerances > &tolerances)
	set the tolerances to be used by the starter More...

virtual const std::shared_ptr< Tolerances > &	tolerances () const
	get the toelrances used by the starter More...

virtual const char *	getName () const
	get name of starter. More...

	SPxStarter (const char *name)
	constructor More...

	SPxStarter (const SPxStarter &old)
	copy constructor More...

SPxStarter &	operator= (const SPxStarter &rhs)
	assignment operator More...

virtual	~SPxStarter ()
	destructor. More...

Protected Member Functions
Protected helpers
void	setupWeights (SPxSolverBase< R > &base)
	sets up variable weights. More...

Protected helpers

Private Attributes
Data
VectorBase< R >	vec
	the current (approximate) primal or dual vector More...

Types
enum soplex::SPxVectorST::{ NONE, PVEC, DVEC }	state
	specifies whether to work on the primal, the dual, or not at all. More...

Additional Inherited Members
Protected Attributes inherited from SPxWeightST< R >
Array< R >	rowWeight
	weight value for LP rows. More...

Array< R >	colWeight
	weight value for LP columns. More...

DataArray< bool >	rowRight
	set variable to rhs?. More...

DataArray< bool >	colUp
	set primal variable to upper bound. More...

Protected Attributes inherited from SPxStarter< R >
const char *	m_name
	name of the starter More...

std::shared_ptr< Tolerances >	_tolerances
	tolerances for the starter More...

Detailed Description

template<class R>
class soplex::SPxVectorST< R >

Solution vector based start basis.

This version of SPxWeightST can be used to construct a starting basis for an LP to be solved with SoPlex if an approximate solution vector or dual vector (possibly optained by a heuristic) is available. This is done by setting up weights for the SPxWeightST it is derived from.

The primal vector to be used is loaded by calling method primal() while dual() setups for the dual vector. Methods primal() or dual() must be called before generate() is called by SoPlex to set up a starting basis. If more than one call of method primal() or dual() occurred only the most recent one is valid for generating the starting base.

Definition at line 54 of file spxvectorst.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

private

specifies whether to work on the primal, the dual, or not at all.

Enumerator
NONE
PVEC
DVEC

Definition at line 62 of file spxvectorst.h.

Constructor & Destructor Documentation

◆ SPxVectorST() [1/2]

SPxVectorST ( )

default constructor.

Definition at line 87 of file spxvectorst.h.

References SPxStarter< R >::m_name.

Referenced by SPxVectorST< R >::clone().

◆ SPxVectorST() [2/2]

SPxVectorST ( const SPxVectorST< R > & old )

copy constructor

Definition at line 93 of file spxvectorst.h.

References SPxWeightST< R >::isConsistent().

◆ ~SPxVectorST()

virtual ~SPxVectorST ( )

virtual

destructor.

Definition at line 115 of file spxvectorst.h.

Member Function Documentation

◆ clone()

virtual SPxStarter<R>* clone ( ) const

virtual

clone function for polymorphism

Reimplemented from SPxWeightST< R >.

Reimplemented in SPxSumST< R >.

Definition at line 118 of file spxvectorst.h.

References SPxVectorST< R >::SPxVectorST().

◆ dual()

void dual ( const VectorBase< R > & v )

sets up primal solution vector.

Definition at line 134 of file spxvectorst.h.

References SPxVectorST< R >::DVEC.

◆ operator=()

SPxVectorST& operator= ( const SPxVectorST< R > & rhs )

assignment operator

Definition at line 101 of file spxvectorst.h.

References SPxWeightST< R >::isConsistent(), SPxWeightST< R >::operator=(), SPxVectorST< R >::state, and SPxVectorST< R >::vec.

Referenced by SPxSumST< R >::operator=().

◆ primal()

void primal ( const VectorBase< R > & v )

sets up primal solution vector.

Definition at line 128 of file spxvectorst.h.

References SPxVectorST< R >::PVEC.

◆ setupWeights()

void setupWeights ( SPxSolverBase< R > & base )

protectedvirtual

sets up variable weights.

Reimplemented from SPxWeightST< R >.

Member Data Documentation

◆ state

enum { ... } state

specifies whether to work on the primal, the dual, or not at all.

Referenced by SPxVectorST< R >::operator=().

◆ vec

VectorBase<R> vec

private

the current (approximate) primal or dual vector

Definition at line 69 of file spxvectorst.h.