/***********************************************************************
This file is part of KEEL-software, the Data Mining tool for regression,
classification, clustering, pattern mining and so on.
Copyright (C) 2004-2010
F. Herrera (herrera@decsai.ugr.es)
L. S�nchez (luciano@uniovi.es)
J. Alcal�-Fdez (jalcala@decsai.ugr.es)
S. Garc�a (sglopez@ujaen.es)
A. Fern�ndez (alberto.fernandez@ujaen.es)
J. Luengo (julianlm@decsai.ugr.es)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/
**********************************************************************/
/**
* <p>
* @author Written by Albert Orriols (La Salle, Ram�n Llull University - Barcelona) 28/03/2004
* @author Modified by Xavi Sol� (La Salle, Ram�n Llull University - Barcelona) 03/12/2008
* @version 1.1
* @since JDK1.2
* </p>
*/
package keel.Algorithms.Genetic_Rule_Learning.XCS;
import keel.Algorithms.Genetic_Rule_Learning.XCS.KeelParser.Config;
import java.util.*;
import java.lang.*;
import java.io.*;
public class IFreeMutation implements IntegerMutation {
/**
* <p>
* This class implements the free mutation. So, a gene can be changed for
* any valid value in the representation.
* </p>
*/
///////////////////////////////////////
// operations
/**
* <p>
* Mutates the lower real value.
* </p>
* <p>
*
* @param lowerValue is the current lower value of this classifier position
* </p>
* <p>
* @param upperValue is the current upper value of this classifier position.
* </p>
* <p>
* @param currentState is the current State of the environment for this
* allele of the classifier.
* </p>
* <p>
* @return a double with the mutated value
* </p>
*/
public int mutateLower(int lowerValue, int upperValue, int currentState, int scale) {
int des = 0;
if (Config.rand() < Config.pM){
des = (int) ((Config.rand() - 0.5)*2 * Config.m_0 * (double)scale); //We obtain a number between -1 and 1.
lowerValue += des;
}
return lowerValue;
} // end mutateLower
/**
* <p>
* Mutates the upper real value.
* <p>
* @return a double with the mutated value.
* </p>
*/
public int mutateUpper(int lowerValue, int upperValue, int currentState, int scale) {
int des = 0;
if (Config.rand() < Config.pM){
des = (int) ((Config.rand() - 0.5)*2 * Config.m_0 * (double)scale); //We obtain a number between -1 and 1.
upperValue += des;
}
return upperValue;
} // end mutateUpper
} // end IFreeMutation