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File org.dgpf.search.algorithms.sa.ta.ArithmeticAdaption.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-06-05 13:27:42
 * Created by       : Stefan Niemczyk, Marc Kirchhoff
 * Original Filename: org.dgpf.search.algorithms.sa.ta.ArithmeticAdaption.java
 * Version          : 1.0.1
 * Last modification: 2006-06-22
 *                by: Thomas Weise
 * 
 * License          : GNU LESSER GENERAL PUBLIC LICENSE
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 *                    
 * Warranty         : This software is provided "as is" without any
 *                    warranty; without even the implied warranty of
 *                    merchantability or fitness for a particular purpose.
 *                    See the Gnu Lesser General Public License for more
 *                    details.
 */

 
package org.dgpf.search.algorithms.sa.ta;

import org.dgpf.search.algorithms.sa.SAParameters;
import org.dgpf.search.algorithms.sa.SAUtils;

/**
 * This class adapts the temperature value.
 * Calculation Temperature(n) = Temperature(n-1) - constant
 * @author Stefan Niemczyk, Marc Kirchhoff
 */

public class ArithmeticAdaption extends TemperatureAdaptionStrategy
  {
/**
 * The serial version uid.
 */

  private static  final long  serialVersionUID  = 1;
  
/**
 * The default instance of the arithmetic temperature adaption.
 */

  public  static  final TemperatureAdaptionStrategy DEFAULT_INSTANCE
   = new ArithmeticAdaption(SAUtils.DEFAULT_REDUCE_CONSTANT);
  
/**
 * A constant to reduce the temperature.
 */

  private double m_reduce_constant;
  
/**
 * Create a new arithmetic temperature adaptation strategy.
 * @param p_reduce_constant A constant to reduce the temperature.
 */

  public  ArithmeticAdaption(final double p_reduce_constant)
    {
    super();
    
    this.m_reduce_constant = ((p_reduce_constant >= 0.0d) ?
             p_reduce_constant : SAUtils.DEFAULT_REDUCE_CONSTANT);
    }
  
/**
 * This methode adapts the temperature value.
 * @param p_sap   The simulated anneling parameters
 */

  @Override
  public void adapt_temperature(SAParameters<?> p_sap)
    {
    double l_t, l_k, l_nt;
    
    l_t=p_sap.get_temperature();
    l_k=this.m_reduce_constant;
    
    l_nt=l_t-l_k;
    
    if(l_nt<=0)l_nt=0.000000000000001;
    
    p_sap.set_temperature(l_nt);
    }
  
/**
 * Obtain the name of this adaptation strategy.
 * @return The name of this adaptation strategy.
 */

  @Override
  public  final String  toString()
    {
    return (super.toString() + '[' + this.m_reduce_constant + ']');
    }
  }

File Information:

file name:ArithmeticAdaption.java
package:org.dgpf.search.algorithms.sa.ta
qualified name:org.dgpf.search.algorithms.sa.ta.ArithmeticAdaption.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/algorithms/sa/ta/ArithmeticAdaption.java
size:2.900 KB (2970 B)
uploaded: 2015-07-22 04:10:59 GMT+0000
last update: 2006-07-24 12:16:45 GMT+0000
last access: 2017-11-21 15:28:08 GMT+0000

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