ec.app.regression
Class Regression

java.lang.Object
  extended by ec.Problem
      extended by ec.gp.GPProblem
          extended by ec.app.regression.Regression
All Implemented Interfaces:
Prototype, Setup, SimpleProblemForm, java.io.Serializable, java.lang.Cloneable
Direct Known Subclasses:
Quintic, Sextic

public class Regression
extends GPProblem
implements SimpleProblemForm

Regression implements the Koza (quartic) Symbolic Regression problem.

The equation to be regressed is y = x^4 + x^3 + x^2 + x, {x in [-1,1]}

This equation was introduced in J. R. Koza, GP II, 1994.

Parameters

base.data
classname, inherits or == ec.app.regression.RegressionData
(the class for the prototypical GPData object for the Regression problem)
base.size
int >= 1
(the size of the training set)

Parameter bases

base.data species (the GPData object)

Version:
1.0
Author:
Sean Luke
See Also:
Serialized Form

Field Summary
 double currentValue
           
 RegressionData input
           
 double[] inputs
           
 double[] outputs
           
static java.lang.String P_SIZE
           
 int trainingSetSize
           
 
Fields inherited from class ec.gp.GPProblem
data, P_DATA, P_GPPROBLEM, P_STACK, stack
 
Fields inherited from class ec.Problem
P_PROBLEM
 
Constructor Summary
Regression()
           
 
Method Summary
 java.lang.Object clone()
          Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context.
 void evaluate(EvolutionState state, Individual ind, int subpopulation, int threadnum)
          Evaluates the individual in ind, if necessary (perhaps not evaluating them if their evaluated flags are true), and sets their fitness appropriately.
 double func(double x)
           
 void setup(EvolutionState state, Parameter base)
          Sets up the object by reading it from the parameters stored in state, built off of the parameter base base.
 
Methods inherited from class ec.gp.GPProblem
defaultBase, describe
 
Methods inherited from class ec.Problem
canEvaluate, closeContacts, describe, evaluate, finishEvaluating, getBase, initializeContacts, prepareToEvaluate, reinitializeContacts, setBase
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface ec.simple.SimpleProblemForm
canEvaluate, describe, describe, evaluate
 

Field Detail

P_SIZE

public static final java.lang.String P_SIZE
See Also:
Constant Field Values

currentValue

public double currentValue

trainingSetSize

public int trainingSetSize

inputs

public double[] inputs

outputs

public double[] outputs

input

public RegressionData input
Constructor Detail

Regression

public Regression()
Method Detail

func

public double func(double x)

clone

public java.lang.Object clone()
Description copied from interface: Prototype
Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context.

Typically this should be a full "deep" clone. However, you may share certain elements with other objects rather than clone hem, depending on the situation:

Implementations.

Specified by:
clone in interface Prototype
Overrides:
clone in class GPProblem

setup

public void setup(EvolutionState state,
                  Parameter base)
Description copied from interface: Prototype
Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. If an ancestor implements this method, be sure to call super.setup(state,base); before you do anything else.

For prototypes, setup(...) is typically called once for the prototype instance; cloned instances do not receive the setup(...) call. setup(...) may be called more than once; the only guarantee is that it will get called at least once on an instance or some "parent" object from which it was ultimately cloned.

Specified by:
setup in interface Prototype
Specified by:
setup in interface Setup
Overrides:
setup in class GPProblem

evaluate

public void evaluate(EvolutionState state,
                     Individual ind,
                     int subpopulation,
                     int threadnum)
Description copied from interface: SimpleProblemForm
Evaluates the individual in ind, if necessary (perhaps not evaluating them if their evaluated flags are true), and sets their fitness appropriately.

Specified by:
evaluate in interface SimpleProblemForm
Overrides:
evaluate in class Problem