FitnessEvaluation.externalInterpreters.SymbolicRegression
Class SymRegFunkBSF

java.lang.Object
  FitnessEvaluation.externalInterpreters.SymbolicRegression.SymRegFunkBSF

public abstract class SymRegFunkBSF
extends java.lang.Object

help class for SymbolicRegression.java

Author:

jonatan

Constructor Summary

SymRegFunkBSF()
Creates a new instance of SymRegFunkBSF

Method Summary

double	cos(double x) Trigonometric cosine function
double	div(double n, double d) Protected division.
double	exp(double x) Returns Euler's number e raised to the power of a double value.
abstract double	expr(double X) Expression to evaluate
double	fun(double x) Hardcoded quadratic target function
double	getFitness() Calculating the fitness as the sum of errors.
double	inv(double x) Method for inverting x.
double	log(double x) Natural logarithm
double	pow(double x, double y) Method for x to the power of y
double	sin(double x) Trigonometric sine function

Methods inherited from class java.lang.Object

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

Constructor Detail

SymRegFunkBSF

public SymRegFunkBSF()

Creates a new instance of SymRegFunkBSF

Method Detail

expr

public abstract double expr(double X)

Expression to evaluate

Parameters:

X - point

Returns:

value

getFitness

public double getFitness()

Calculating the fitness as the sum of errors. Deterministically picks 20 points in [-1,1) Minimizing, 0 is best

Returns:

value as sum of errors

fun

public double fun(double x)

Hardcoded quadratic target function

Parameters:

x - value

Returns:

target function value

inv

public double inv(double x)

Method for inverting x. Returns 1 if x = 0

Parameters:

x - value to invert

Returns:

inverted value

pow

public double pow(double x,
                  double y)

Method for x to the power of y

Parameters:

x - base

y - exponent

Returns:

x^y

div

public double div(double n,
                  double d)

Protected division. If d = 0. Return Double.MAX_VALUE. If n = 0 return 0

Parameters:

n - dividend

d - divisor

Returns:

quotient

sin

public double sin(double x)

Trigonometric sine function

Parameters:

x - angle in radians

Returns:

sine of argument

cos

public double cos(double x)

Trigonometric cosine function

Parameters:

x - angle in radians

Returns:

cosine of argument

exp

public double exp(double x)

Returns Euler's number e raised to the power of a double value.

Parameters:

x - exponent to raise e to

Returns:

e^a

log

public double log(double x)

Natural logarithm

Parameters:

x - value to take the logarithm of

Returns:

log(x)