ec.app.parity

Class Parity

java.lang.Object

ec.Problem

ec.gp.GPProblem

ec.app.parity.Parity

All Implemented Interfaces:

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

public class Parity
extends GPProblem
implements SimpleProblemForm

Parity implements the family of n-[even|odd]-Parity problems up to 32-parity. Read the README file in this package for information on how to set up the parameter files to your liking -- it's a big family.

The Parity family evolves a boolean function on n sets of bits, which returns true if the number of 1's is even (for even-parity) or odd (for odd-parity), false otherwise.

Parameters

base.data classname, inherits or == ec.app.parity.ParityData	(the class for the prototypical GPData object for the Parity problem)
base.even bool = true (default) or false	(is this even-parity (as opposed to odd-parity)?)
base.bits 2 >= int <= 31	(The number of data bits)

Parameter bases

base.data

species (the GPData object)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
int	bits
boolean	doEven
int	numBits
static java.lang.String	P_EVEN
static java.lang.String	P_NUMBITS
int	totalSize

Fields inherited from class ec.gp.GPProblem

input, P_DATA, P_GPPROBLEM, P_STACK, stack

Fields inherited from class ec.Problem

P_PROBLEM

Constructor Summary

Constructors

Constructor and Description
Parity()

Method Summary

Modifier and Type	Method and Description
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.
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

clone, defaultBase

Methods inherited from class ec.Problem

canEvaluate, closeContacts, describe, describe, finishEvaluating, initializeContacts, prepareToEvaluate, reinitializeContacts

Methods inherited from class java.lang.Object

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

Methods inherited from interface ec.simple.SimpleProblemForm

describe

Field Detail

P_NUMBITS

public static final java.lang.String P_NUMBITS

See Also:

Constant Field Values

P_EVEN

public static final java.lang.String P_EVEN

See Also:

Constant Field Values

doEven

public boolean doEven

numBits

public int numBits

totalSize

public int totalSize

bits

public int bits

Constructor Detail

Parity

public Parity()

Method Detail

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