ilog.opl

Class IloCplex.BasisStatus

java.lang.Object

ilog.opl.IloCplex.BasisStatus

Enclosing class:

IloCplex

public static class IloCplex.BasisStatus
extends java.lang.Object

Enumeration of possible basis status codes. A basis captures the essence of a solution of the simplex algorithm and can be used, among other things, to warm start an optimization with the simplex algorithm. The class IloCplex.BasisStatus distinguishes three nonbasic statuses and one basic status for the variables (columns) and constraints (rows) of an LP or QP.

Field Summary

Fields

Modifier and Type	Field and Description
static IloCplex.BasisStatus	AtLower This status indicates that the variable or slack corresponding to a constraint is nonbasic and at its bound.
static IloCplex.BasisStatus	AtUpper This status indicates that the variable or slack corresponding to a constraint is nonbasic, and at its upper bound.
static IloCplex.BasisStatus	Basic This status indicates that the variable or slack corresponding to a constraint is basic.
static IloCplex.BasisStatus	FreeOrSuperbasic This status indicates that the variable is nonbasic, but not at a bound.
static IloCplex.BasisStatus	NotABasicStatus This status represents an illegal basis status.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) This method can be use to test whether two basis statuses are equal.
java.lang.String	toString() Transforms the status into a human readable string.

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

NotABasicStatus

public static final IloCplex.BasisStatus NotABasicStatus

This status represents an illegal basis status. No valid basis may contain such a status.

AtLower

public static final IloCplex.BasisStatus AtLower

This status indicates that the variable or slack corresponding to a constraint is nonbasic and at its bound. In cases where the variable has both finite upper and lower bounds, this status indicates that the variable is set to its lower bound.

Basic

public static final IloCplex.BasisStatus Basic

This status indicates that the variable or slack corresponding to a constraint is basic.

AtUpper

public static final IloCplex.BasisStatus AtUpper

This status indicates that the variable or slack corresponding to a constraint is nonbasic, and at its upper bound.

FreeOrSuperbasic

public static final IloCplex.BasisStatus FreeOrSuperbasic

This status indicates that the variable is nonbasic, but not at a bound. Either the variable is free and set to 0 or it is set to a specific value as a super-basic variable.

Method Detail

toString

public java.lang.String toString()

Transforms the status into a human readable string.

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

This method can be use to test whether two basis statuses are equal.

Overrides:

equals in class java.lang.Object