examples.gp
Class MathProblem

java.lang.Object
  org.jgap.gp.GPProblem
      examples.gp.MathProblem

public class MathProblem
extends GPProblem

Example demonstrating Genetic Programming (GP) capabilities of JGAP. Also demonstrates usage of ADF's.
The problem is to find a formula for a given truth table (X/Y-pairs).

• The setup of the GP is done in method main and specifically in method create()
• The problem solving process is started via gp.evolve(800) in the main method, with 800 the maximum number of evolutions to take place.
• The evaluation of the evolved formula is done in fitness function FormulaFitnessFunction, which is implemented in this class, MathProblem

For details, please see the mentioned methods and the fitness function.

Since:

3.0

Nested Class Summary

static class

MathProblem.FormulaFitnessFunction Fitness function for evaluating the produced fomulas, represented as GP programs.

Field Summary

static Variable	vx
protected static java.lang.Float[]	x
protected static float[]	y

Constructor Summary

MathProblem(GPConfiguration a_conf)

Method Summary

GPGenotype	create() This method is used for setting up the commands and terminals that can be used to solve the problem.
static void	main(java.lang.String[] args) Starts the example.

Methods inherited from class org.jgap.gp.GPProblem

createTree, getGPConfiguration, setGPConfiguration, showTree, showTree

Methods inherited from class java.lang.Object

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

Field Detail

vx

public static Variable vx

x

protected static java.lang.Float[] x

y

protected static float[] y

Constructor Detail

MathProblem

public MathProblem(GPConfiguration a_conf)
            throws InvalidConfigurationException

Throws:

InvalidConfigurationException

Method Detail

create

public GPGenotype create()
                  throws InvalidConfigurationException

This method is used for setting up the commands and terminals that can be used to solve the problem. In this example an ADF (an automatically defined function) is used for demonstration purpuses. Using an ADF is optional. If you want to use one, care about the places marked with "ADF-relevant:" below. If you do not want to use an ADF, please remove the below places (and reduce the outer size of the arrays "types", "argTypes" and "nodeSets" to one). Please notice, that the variables types, argTypes and nodeSets correspond to each other: they have the same number of elements and the element at the i'th index of each variable corresponds to the i'th index of the other variables!

Specified by:

create in class GPProblem

Returns:

GPGenotype

Throws:

InvalidConfigurationException

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Starts the example.

Parameters:

args - ignored

Throws:

java.lang.Exception

Since:

3.0