ExpressionTreeGenerator

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Class

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Deprecated

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org.maloi.evolvo.expressiontree.utilities
Class ExpressionTreeGenerator

java.lang.Object
  org.maloi.evolvo.expressiontree.utilities.ExpressionTreeGenerator

public class ExpressionTreeGenerator
extends java.lang.Object

Creates a randomly generated symbolic expression and places it in an expressionTree. The generation process is influenced by several parameters contain in a globalSettings object. The most significant are the properties "complexity," "depreciation," and "variable.probability." The complexity value determines how likely the node being produced is to be a terminal node, where the lower complexity's value, the more likely it is to be terminal. Depreciation is a value that is subtracted from complexity at each level of the tree, to ensure the generation process will end within a reasonable number of tree levels. The variable.probability determines how likely a terminal node is to be a value or a variable, where higher values mean variables are more likely to occur than values. All three of these settings should fall in the range of 0.0 to 1.0. Depreciation, however, should never actually be 0.0.

Field Summary

(package private) static org.maloi.evolvo.expressiontree.operators.OperatorInterface[] list
          A list of the available operators.

(package private) static org.maloi.evolvo.settings.GlobalSettings settings


(package private) static VariablePackage variables
          The variables the generated expression may use.

Constructor Summary

private ExpressionTreeGenerator()
          Just prevent anyone from constructing us

Method Summary

static org.maloi.evolvo.expressiontree.ExpressionTree generate(double level, java.util.Random randomNumber)
          Returns a generated expressionTree based on the given Random object, starting at the levelth level of the tree.

static org.maloi.evolvo.expressiontree.ExpressionTree generate(java.util.Random randomNumber)
          Returns a generated expressionTree based on the given Random object.

Methods inherited from class java.lang.Object

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

Field Detail

variables

static VariablePackage variables

The variables the generated expression may use.

settings

static org.maloi.evolvo.settings.GlobalSettings settings

list

static org.maloi.evolvo.expressiontree.operators.OperatorInterface[] list

A list of the available operators.

Constructor Detail