org.jgap.gp.function.statistics

Class Kurtosis

java.lang.Object

org.jgap.gp.CommandGene

org.jgap.gp.CommandDynamicArity

org.jgap.gp.function.statistics.Kurtosis

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Comparable, ICloneable

public class Kurtosis
extends CommandDynamicArity
implements ICloneable

Computes the Kurtosis of the available values.

We use the following (unbiased) formula to define kurtosis:

kurtosis = { [n(n+1) / (n -1)(n - 2)(n-3)] sum[(x_i - mean)^4] / std^4 } - [3(n-1)^2 / (n-2)(n-3)]

where n is the number of values, and std is the Standard Deviation

Since:

3.5

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.jgap.gp.CommandGene

CommandGene.COMMAND_TYPE

Field Summary

Fields inherited from class org.jgap.gp.CommandGene

BooleanClass, CharacterClass, DELTA, DoubleClass, FloatClass, IntegerClass, LongClass, nodeIndex, VoidClass

Fields inherited from interface org.jgap.util.ICloneable

CVS_REVISION

Constructor Summary

Constructors

Constructor and Description
Kurtosis(GPConfiguration a_conf, int a_arityInitial, int a_arityMin, int a_arityMax, java.lang.Class a_returnType)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone()
double	execute_double(ProgramChromosome c, int n, java.lang.Object[] args) Executes this node as a double.
float	execute_float(ProgramChromosome c, int n, java.lang.Object[] args) Executes this node as a float.
java.lang.String	getName()
java.lang.String	toString()

Methods inherited from class org.jgap.gp.CommandDynamicArity

dynamizeArity

Methods inherited from class org.jgap.gp.CommandGene

cleanup, compareTo, ensureUniqueness, ensureUniqueness, ensureUniqueness2, equals, execute_boolean, execute_int, execute_long, execute_object, execute_void, execute, getAllele, getApplicationData, getArity, getChildType, getEnergy, getGPConfiguration, getPersistentRepresentation, getReturnType, getSubChildType, getSubChildTypes, getSubReturnType, hashCode, isAffectGlobalState, isCompareApplicationData, isFloatType, isIntegerType, isValid, isValid, setAllele, setApplicationData, setCompareApplicationData, setEnergy, setNoValidation, setReturnType, setToRandomValue, setValueFromPersistentRepresentation, size

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Kurtosis

public Kurtosis(GPConfiguration a_conf,
                int a_arityInitial,
                int a_arityMin,
                int a_arityMax,
                java.lang.Class a_returnType)
         throws InvalidConfigurationException

Throws:

InvalidConfigurationException

Method Detail

toString

public java.lang.String toString()

Specified by:

toString in class CommandGene

Returns:

the string representation of the command. Especially usefull to output a resulting formula in human-readable form.

execute_double

public double execute_double(ProgramChromosome c,
                             int n,
                             java.lang.Object[] args)

Description copied from class: CommandGene

Executes this node as a double. Override to implement.

Overrides:

execute_double in class CommandGene

Parameters:

c - ignored here

n - ignored here

args - ignored here

Returns:

nothing but exception

execute_float

public float execute_float(ProgramChromosome c,
                           int n,
                           java.lang.Object[] args)

Description copied from class: CommandGene

Executes this node as a float. Override to implement.

Overrides:

execute_float in class CommandGene

Parameters:

c - ignored here

n - ignored here

args - ignored here

Returns:

nothing but exception

getName

public java.lang.String getName()

Overrides:

getName in class CommandGene

clone

public java.lang.Object clone()

Specified by:

clone in interface ICloneable

Overrides:

clone in class java.lang.Object

Returns:

clone of the current object instance