abacus::SlackStat Class Reference

Status of slack variables. More...

#include <ogdf/lib/abacus/slackstat.h>

Inheritance diagram for abacus::SlackStat:

Public Types
enum	STATUS { Basic, NonBasicZero, NonBasicNonZero, Unknown }
	The different statuses of a slack variable. More...

Public Member Functions
	SlackStat ()
	Initializes the status to Unknown. More...
	SlackStat (STATUS status)
	Initializes the status to status. More...
STATUS	status () const
	Returns the status of the slack variable. More...
void	status (const SlackStat *stat)
	Sets the status to the status of stat. More...
void	status (STATUS stat)
	Sets the status of the slack variable to stat. More...
Public Member Functions inherited from abacus::AbacusRoot
virtual	~AbacusRoot ()
	The destructor. More...

Private Attributes
STATUS	status_
	The status of the slack variable. More...

Friends
std::ostream &	operator<< (std::ostream &out, const SlackStat &rhs)
	Output operator for slack statuses. More...

Additional Inherited Members
Static Public Member Functions inherited from abacus::AbacusRoot
static bool	ascii2bool (const string &str)
	Converts the string str to a boolean value. More...
static bool	endsWith (const string &str, const string &end)
	Returns true if str ends with end, false otherwise. More...
static double	fracPart (double x)
	Returns the absolute value of the fractional part of x. More...
static const char *	onOff (bool value)
	Converts a boolean variable to the strings "on" and "off". More...

Detailed Description

Status of slack variables.

As for the structural variables the simplex method also assigns a unique status to each slack variable. A slack variable can be a basic or a nonbasic variable. If it is a nonbasic variable, then we distinguish if the slack variable has value zero or nonzero.

Definition at line 48 of file slackstat.h.

Member Enumeration Documentation

STATUS

enum abacus::SlackStat::STATUS

The different statuses of a slack variable.

Enumerator
Basic	The slack variable belongs to the basis.
NonBasicZero	The slack variable does not belong to the basis and has value zero.
NonBasicNonZero	The slack variable does not belong to the basis and has a nonzero value.
Unknown	The status of the slack variable is not known since no linear program with the corresponding constraint has been solved.

Definition at line 52 of file slackstat.h.

Constructor & Destructor Documentation

SlackStat() [1/2]

abacus::SlackStat::SlackStat ( )

inline

Initializes the status to Unknown.

Definition at line 65 of file slackstat.h.

SlackStat() [2/2]

abacus::SlackStat::SlackStat ( STATUS  status )

inline

Initializes the status to status.

Parameters

status

The slack variable receives the status status.

Definition at line 71 of file slackstat.h.

Member Function Documentation

status() [1/3]

STATUS abacus::SlackStat::status ( ) const

inline

Returns the status of the slack variable.

Definition at line 87 of file slackstat.h.

status() [2/3]

void abacus::SlackStat::status ( const SlackStat *  stat )

inline

Sets the status to the status of stat.

Parameters

stat	The status of the slack variable is set to *stat.

Definition at line 101 of file slackstat.h.

status() [3/3]

void abacus::SlackStat::status ( STATUS  stat )

inline

Sets the status of the slack variable to stat.

Parameters

stat	The new status of the slack variable.

Definition at line 94 of file slackstat.h.

Friends And Related Function Documentation

operator<<

std::ostream& operator<< ( std::ostream &  out, const SlackStat &  rhs  )

friend

Output operator for slack statuses.

The output operator writes the status to an output stream in the format Basic, NonBasicZero, NonBasicNonZero, or Unknown.

Parameters

out	The output stream.
rhs	The status being output.

Returns

A reference to the output stream.

Member Data Documentation

status_

STATUS abacus::SlackStat::status_

private

The status of the slack variable.

Definition at line 106 of file slackstat.h.

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

• include/ogdf/lib/abacus/slackstat.h