jmetal.problems.WFG
Class WFG

java.lang.Object
  jmetal.core.Problem
      jmetal.problems.WFG.WFG

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

WFG1, WFG2, WFG3, WFG4, WFG5, WFG6, WFG7, WFG8, WFG9

public abstract class WFG
extends Problem

Implements a reference abstract class for all WFG test problems Reference: Simon Huband, Luigi Barone, Lyndon While, Phil Hingston A Scalable Multi-objective Test Problem Toolkit. Evolutionary Multi-Criterion Optimization: Third International Conference, EMO 2005. Proceedings, volume 3410 of Lecture Notes in Computer Science

See Also:

Serialized Form

Field Summary

protected int[]	A_
protected int	D_
protected int	k_
protected int	l_
protected int	M_
protected java.util.Random	random
protected int[]	S_

Fields inherited from class jmetal.core.Problem

length_, lowerLimit_, numberOfConstraints_, numberOfObjectives_, numberOfVariables_, problemName_, solutionType_, upperLimit_

Constructor Summary

WFG(java.lang.String solutionType, java.lang.Integer k, java.lang.Integer l, java.lang.Integer M)
Constructor Creates a WFG problem

Method Summary

float[]	calculate_x(float[] t) Gets the x vector (consulte WFG tooltik reference)
float	correct_to_01(float a)
abstract float[]	evaluate(float[] variables) Evaluates a solution
float[]	normalise(float[] z) Normalizes a vector (consulte WFG toolkit reference)
float[]	subVector(float[] z, int head, int tail) Gets a subvector of a given vector (Head inclusive and tail inclusive)

Methods inherited from class jmetal.core.Problem

evaluate, evaluateConstraints, getLength, getLowerLimit, getName, getNumberOfBits, getNumberOfConstraints, getNumberOfObjectives, getNumberOfVariables, getPrecision, getPrecision, getSolutionType, getUpperLimit, setNumberOfVariables, setPrecision, setSolutionType

Methods inherited from class java.lang.Object

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

Field Detail

k_

protected int k_

M_

protected int M_

l_

protected int l_

A_

protected int[] A_

S_

protected int[] S_

D_

protected int D_

random

protected java.util.Random random

Constructor Detail

WFG

public WFG(java.lang.String solutionType,
           java.lang.Integer k,
           java.lang.Integer l,
           java.lang.Integer M)

Constructor Creates a WFG problem

Parameters:

k - position-related parameters

l - distance-related parameters

M - Number of objectives

solutionType - The solution type must "Real" or "BinaryReal".

Method Detail

calculate_x

public float[] calculate_x(float[] t)

Gets the x vector (consulte WFG tooltik reference)

normalise

public float[] normalise(float[] z)

Normalizes a vector (consulte WFG toolkit reference)

correct_to_01

public float correct_to_01(float a)

subVector

public float[] subVector(float[] z,
                         int head,
                         int tail)

Gets a subvector of a given vector (Head inclusive and tail inclusive)

Parameters:

z - the vector

Returns:

the subvector

evaluate

public abstract float[] evaluate(float[] variables)

Evaluates a solution

Parameters:

variables - The solution to evaluate

Returns:

a double [] with the evaluation results