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File org.dgpf.gp.regression.expressions.Costs.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-25 11:22:11
 * Original Filename: org.dgpf.gp.regression.expressions.Costs.java
 * Version          : 1.0.0
 * Last modification: 2006-07-25
 *                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.gp.regression.expressions;

import org.sfc.utils.Typesafe;

/**
 * This class contains the costs for some of the operations.
 *
 * @author Thomas Weise
 */

public final  class Costs
  {
/**
 * The costs used to load the value of a constant.
 */

  public static final double  CONSTANT_COSTS         = 1.0d;
/**
 * The costs for one access to a varialbe (read or write).
 */

  public static final double  VARIABLE_ACCESS_COSTS  =
                                              CONSTANT_COSTS;
//                                  (CONSTANT_COSTS * 3.5d);  
/**
 * The cost for an addition.
 */

  public static final double  ADD_COSTS              =
                                   ((2.0d * VARIABLE_ACCESS_COSTS) + 1.0d);  
/**
 * The cost for a subtraction.
 */

  public static final double  SUB_COSTS              = 
                                  ADD_COSTS;  
/**
 * The cost for an absolute value.
 */

  public static final double  ABS_COSTS              = (0.5d * ADD_COSTS);
/**
 * The cost for a minimum.
 */

  public static final double  MIN_COSTS              = 
                                  ADD_COSTS;  
/**
 * The cost for a maximum.
 */

  public static final double  MAX_COSTS              = 
                                  ADD_COSTS;  
/**
 * The cost for a multiplication.
 */

  public static final double  MUL_COSTS              =
                                   (ADD_COSTS + 2.0d);    
/**
 * The cost for a division.
 */

  public static final double  DIV_COSTS              =
                                    (MUL_COSTS + 4.0d);
/**
 * The cost for a power.
 */

  public static final double  POWER_COSTS              =
                                   ((DIV_COSTS+MUL_COSTS) + 4.0d);
  
/**
 * No instance of this class will ever be.
 */

  private Costs()
    {
    Typesafe.do_not_call();
    }
  }

File Information:

file name:Costs.java
package:org.dgpf.gp.regression.expressions
qualified name:org.dgpf.gp.regression.expressions.Costs.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/regression/expressions/Costs.java
size:2.974 KB (3046 B)
uploaded: 2015-07-22 04:10:56 GMT+0000
last update: 2006-08-31 07:37:51 GMT+0000
last access: 2017-11-21 15:41:42 GMT+0000

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