Detailed Description

SingletonColumnSignPreprocessor Make sure that the only coefficient of all singleton columns (i.e. column with only one entry) is positive. This is because this way the column will be transformed in an identity column by the scaling. This will lead to more efficient solve when this column is involved.

Definition at line 827 of file preprocessor.h.

#include <preprocessor.h>

Inheritance diagram for operations_research::glop::SingletonColumnSignPreprocessor:

Public Member Functions
	SingletonColumnSignPreprocessor (const GlopParameters *parameters)
	SingletonColumnSignPreprocessor (const SingletonColumnSignPreprocessor &)=delete
SingletonColumnSignPreprocessor &	operator= (const SingletonColumnSignPreprocessor &)=delete
	~SingletonColumnSignPreprocessor () final=default
bool	Run (LinearProgram *lp) final
void	RecoverSolution (ProblemSolution *solution) const final
Public Member Functions inherited from operations_research::glop::Preprocessor
	Preprocessor (const GlopParameters *parameters)
	Preprocessor (const Preprocessor &)=delete
Preprocessor &	operator= (const Preprocessor &)=delete
virtual	~Preprocessor ()
ProblemStatus	status () const
virtual void	UseInMipContext ()
void	SetTimeLimit (TimeLimit *time_limit)

Additional Inherited Members
Protected Member Functions inherited from operations_research::glop::Preprocessor
bool	IsSmallerWithinFeasibilityTolerance (Fractional a, Fractional b) const
bool	IsSmallerWithinPreprocessorZeroTolerance (Fractional a, Fractional b) const
Protected Attributes inherited from operations_research::glop::Preprocessor
ProblemStatus	status_
const GlopParameters &	parameters_
bool	in_mip_context_
std::unique_ptr< TimeLimit >	infinite_time_limit_
TimeLimit *	time_limit_

Constructor & Destructor Documentation

◆ SingletonColumnSignPreprocessor() [1/2]

operations_research::glop::SingletonColumnSignPreprocessor::SingletonColumnSignPreprocessor ( const GlopParameters * parameters )

inlineexplicit

Definition at line 829 of file preprocessor.h.

◆ SingletonColumnSignPreprocessor() [2/2]

operations_research::glop::SingletonColumnSignPreprocessor::SingletonColumnSignPreprocessor ( const SingletonColumnSignPreprocessor & )

delete

◆ ~SingletonColumnSignPreprocessor()

operations_research::glop::SingletonColumnSignPreprocessor::~SingletonColumnSignPreprocessor ( )

finaldefault

Member Function Documentation

◆ operator=()

SingletonColumnSignPreprocessor & operations_research::glop::SingletonColumnSignPreprocessor::operator= ( const SingletonColumnSignPreprocessor & )

delete

◆ RecoverSolution()

void operations_research::glop::SingletonColumnSignPreprocessor::RecoverSolution ( ProblemSolution * solution ) const

finalvirtual

Stores the optimal solution of the linear program that was passed to Run(). The given solution needs to be set to the optimal solution of the linear program "modified" by Run().

Implements operations_research::glop::Preprocessor.

Definition at line 3029 of file preprocessor.cc.