ec.cgp.problems
Class ProblemRegression

java.lang.Object
  ec.Problem
      ec.cgp.problems.ProblemCGP
          ec.cgp.problems.ProblemRegression

All Implemented Interfaces:

ec.Prototype, ec.Setup, ec.simple.SimpleProblemForm, java.io.Serializable, java.lang.Cloneable

public class ProblemRegression
extends ProblemCGP

Regression problem.

Author:

David Oranchak, doranchak@gmail.com, http://oranchak.com

See Also:

Serialized Form

Field Summary

int	function Which function to use.
(package private) static java.lang.String	P_WHICH
(package private) static float[]	testPoints 50 randomly generated test points used for fitness evaluation

Fields inherited from class ec.cgp.problems.ProblemCGP

constantMax, constantMin, constants, numConstants, P_CONSTANT_MAX, P_CONSTANT_MIN, P_CONSTANTS

Fields inherited from class ec.Problem

P_PROBLEM

Constructor Summary

ProblemRegression()

Method Summary

void	evaluate(ec.EvolutionState state, ec.Individual ind, int subpopulation, int threadnum) Evaluate the CGP and compute fitness
static float	function1(float x) Sixth-order polynomial.
static float	function2(float x) Fifth-order polynomial.
static float	function3(float x) Second-order polynomial.
void	setup(ec.EvolutionState state, ec.util.Parameter base) Initialize the evaluation cache, and configure the random constants.

Methods inherited from class ec.cgp.problems.ProblemCGP

describe, initConstants

Methods inherited from class ec.Problem

canEvaluate, clone, closeContacts, defaultBase, finishEvaluating, initializeContacts, prepareToEvaluate, reinitializeContacts

Methods inherited from class java.lang.Object

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

Field Detail

function

public int function

Which function to use. Acceptable values: {1, 2, 3}.

P_WHICH

static java.lang.String P_WHICH

testPoints

static float[] testPoints

50 randomly generated test points used for fitness evaluation

Constructor Detail

ProblemRegression

public ProblemRegression()

Method Detail

evaluate

public void evaluate(ec.EvolutionState state,
                     ec.Individual ind,
                     int subpopulation,
                     int threadnum)

Evaluate the CGP and compute fitness

function1

public static float function1(float x)

Sixth-order polynomial.

function2

public static float function2(float x)

Fifth-order polynomial.

function3

public static float function3(float x)

Second-order polynomial.

setup

public void setup(ec.EvolutionState state,
                  ec.util.Parameter base)

Description copied from class: ProblemCGP

Initialize the evaluation cache, and configure the random constants.

Specified by:

setup in interface ec.Prototype

Specified by:

setup in interface ec.Setup

Overrides:

setup in class ProblemCGP