org.moeaframework.problem.DTLZ
Class DTLZ2

java.lang.Object
  org.moeaframework.problem.AbstractProblem
      org.moeaframework.problem.DTLZ.DTLZ
          org.moeaframework.problem.DTLZ.DTLZ2

All Implemented Interfaces:

Problem, AnalyticalProblem

public class DTLZ2
extends DTLZ

The DTLZ2 test problem.

Field Summary

Fields inherited from class org.moeaframework.problem.AbstractProblem

numberOfConstraints, numberOfObjectives, numberOfVariables

Constructor Summary

DTLZ2(int numberOfObjectives)
Constructs a DTLZ2 test problem with the specified number of objectives.

DTLZ2(int numberOfVariables, int numberOfObjectives)
Constructs a DTLZ2 test problem with the specified number of variables and objectives.

Method Summary

void	evaluate(Solution solution) Evaluates the solution, updating the solution's objectives in place.
Solution	generate() Returns a randomly-generated solution using the analytical solution to this problem.

Methods inherited from class org.moeaframework.problem.DTLZ.DTLZ

newSolution

Methods inherited from class org.moeaframework.problem.AbstractProblem

close, finalize, getName, getNumberOfConstraints, getNumberOfObjectives, getNumberOfVariables

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.moeaframework.core.Problem

close, getName, getNumberOfConstraints, getNumberOfObjectives, getNumberOfVariables

Constructor Detail

DTLZ2

public DTLZ2(int numberOfObjectives)

Constructs a DTLZ2 test problem with the specified number of objectives. This is equivalent to calling new DTLZ2(numberOfObjectives+9, numberOfObjectives)

Parameters:

numberOfObjectives - the number of objectives for this problem

DTLZ2

public DTLZ2(int numberOfVariables,
             int numberOfObjectives)

Constructs a DTLZ2 test problem with the specified number of variables and objectives.

Parameters:

numberOfVariables - the number of variables for this problem

numberOfObjectives - the number of objectives for this problem

Method Detail

evaluate

public void evaluate(Solution solution)

Description copied from interface: Problem

Evaluates the solution, updating the solution's objectives in place. Algorithms must explicitly call this method when appropriate to evaluate new solutions or reevaluate modified solutions.

Parameters:

solution - the solution to be evaluated

generate

public Solution generate()

Description copied from interface: AnalyticalProblem

Returns a randomly-generated solution using the analytical solution to this problem. Note however that discontinuous Pareto surfaces may result in some solutions generated by this method being dominated by other generated solutions. It is therefore recommended using a NondominatedPopulation to removed dominated solutions prior to using the generated reference set.

The generated solutions should be spread uniformly across the entire Pareto frontier; however, this is a suggestion and is not a requirement of this interface.

Returns:

a randomly-generated Pareto optimal solution to this problem