ilog.cplex

Class IloCplex.Quality

java.lang.Object

ilog.cplex.IloCplex.Quality

Enclosing class:

IloCplex

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

Objects of this class contain information computed to measure the quality of a solution.

The possible quality measures are declared in IloCplex.QualityType. A quality object is returned by the method IloCplex.getQuality. The returned quality object contains its type and the numeric value of the requested quality measure. For many quality measures, the value is attained at a specific constraint or variable. In such cases, the relevant constraint or variable is contained in the quality object as well, unless the constraint has been implicitly created as a result of automatic linearization. Methods are provided to query all information stored in a quality object.

For syntactic details about accessing the quality of a solution, see the topic User's Manual: Languages and APIs: Concert Technology for Java users: More solution information: Solution quality.

For special considerations about the information available from the solution of a mixed integer programming (MIP) model, see the topic User's Manual: Discrete optimization: Solving mixed integer programming problems (MIP): Using the MIP solution: Accessing information about the MIP solution. See also the topic User's Manual: Discrete optimization: Solving mixed integer programming problems (MIP): Troubleshooting MIP performance problems: MIP kappa: detecting and coping with ill-conditioned MIP models.

For special considerations about the information available from the solution of a model solved by the barrier optimizer, see the topic User's Manual: Continuous optimization: Solving LPs: barrier optimizer: Understanding solution quality from the barrier LP optimizer .

See Also:

IloCplex.QualityType, IloCplex.getQuality(IloCplex.QualityType), IloCplex.getQuality(IloCplex.QualityType,int)

Constructor Summary

Constructors

Constructor and Description
IloCplex.Quality()

Method Summary

Methods

Modifier and Type	Method and Description
IloConstraint	getConstraint() Returns the constraint for which the quality measure is attained, if any.
IloNumVar	getNumVar() Returns the variable at which the quality measure is attained, if any.
IloCplex.QualityType	getQualityType() Returns the IloCplex.QualityType of the invoking quality measure.
double	getValue() Returns the numeric value of the invoking quality measure.
java.lang.String	toString() Returns a string with the numeric value of the invoking quality measure.

Methods inherited from class java.lang.Object

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

Constructor Detail

IloCplex.Quality

public IloCplex.Quality()

Method Detail

getValue

public double getValue()

Returns the numeric value of the invoking quality measure.

Returns:

The numeric value of the invoking quality measure.

getNumVar

public IloNumVar getNumVar()

Returns the variable at which the quality measure is attained, if any. Otherwise, null is returned.

Returns:

The variable at which the quality measure is attained.

getConstraint

public IloConstraint getConstraint()

Returns the constraint for which the quality measure is attained, if any. Otherwise, null is returned.

Returns:

The constraint for which the quality measure is attained.

toString

public java.lang.String toString()

Returns a string with the numeric value of the invoking quality measure.

Overrides:

toString in class java.lang.Object

Returns:

A string with the numeric value of the invoking quality measure.

getQualityType

public IloCplex.QualityType getQualityType()

Returns the IloCplex.QualityType of the invoking quality measure.

Returns:

The IloCplex.QualityType of the invoking quality measure.