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Java > Open Source Codes > org > jgap > gp > function > Exp


1 /*
2  * This file is part of JGAP.
3  *
4  * JGAP offers a dual license model containing the LGPL as well as the MPL.
5  *
6  * For licencing information please see the file license.txt included with JGAP
7  * or have a look at the top of class org.jgap.Chromosome which representatively
8  * includes the JGAP license policy applicable for any file delivered with JGAP.
9  */

10 package org.jgap.gp.function;
11
12 import org.jgap.*;
13 import org.jgap.gp.*;
14 import org.jgap.gp.impl.*;
15
16 /**
17  * The exponential operation.
18  *
19  * @author Klaus Meffert
20  * @since 3.0
21  */

22 public class Exp
23     extends MathCommand {
24   /** String containing the CVS revision. Read out via reflection!*/
25   private final static String JavaDoc CVS_REVISION = "$Revision: 1.6 $";
26
27   public Exp(final GPConfiguration a_conf, Class JavaDoc a_type)
28       throws InvalidConfigurationException {
29     super(a_conf, 1, a_type);
30   }
31
32   public String JavaDoc toString() {
33     return "Exp(&1)";
34   }
35
36   /**
37    * @return textual name of this command
38    *
39    * @author Klaus Meffert
40    * @since 3.2
41    */

42   public String JavaDoc getName() {
43     return "Exp";
44   }
45
46   public int execute_int(ProgramChromosome c, int n, Object JavaDoc[] args) {
47     int i = c.execute_int(n, 0, args);
48     // clip to -10000 -> 20
49
return (int) Math.exp(Math.max( -10000.0f, Math.min(i, 20.0f)));
50   }
51
52   public float execute_float(ProgramChromosome c, int n, Object JavaDoc[] args) {
53     float f = c.execute_float(n, 0, args);
54     // clip to -10000 -> 20
55
return (float) Math.exp(Math.max( -10000.0f, Math.min(f, 20.0f)));
56   }
57
58   public double execute_double(ProgramChromosome c, int n, Object JavaDoc[] args) {
59     double f = c.execute_double(n, 0, args);
60     // clip to -10000 -> 20
61
return Math.exp(Math.max( -10000.0, Math.min(f, 20.0)));
62   }
63
64   public Object JavaDoc execute_object(ProgramChromosome c, int n, Object JavaDoc[] args) {
65     return ( (Compatible) c.execute_object(n, 0, args)).execute_exp();
66   }
67
68   protected interface Compatible {
69     public Object JavaDoc execute_exp();
70   }
71 }
72
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