/*
* This file is part of JGAP.
*
* JGAP offers a dual license model containing the LGPL as well as the MPL.
*
* For licensing information please see the file license.txt included with JGAP
* or have a look at the top of class org.jgap.Chromosome which representatively
* includes the JGAP license policy applicable for any file delivered with JGAP.
*/
package examples.gp.symbolicRegression;
/*
hakank: This is my take of the Sqrt function.
I just copied the org.jgap.gp.function.Log and changed
accordingly...
*/
import org.jgap.*;
import org.jgap.gp.*;
import org.jgap.gp.impl.*;
import org.jgap.util.*;
/**
* Returns the natural logarithm (base e) of a double value.
*
* @author Klaus Meffert
* @since 3.5
*/
public class Sqrt
extends MathCommand implements ICloneable {
/** String containing the CVS revision. Read out via reflection!*/
private final static String CVS_REVISION = "$Revision: 1.1 $";
public Sqrt(final GPConfiguration a_conf, Class a_returnType)
throws InvalidConfigurationException {
super(a_conf, 1, a_returnType);
}
public String toString() {
return "sqrt &1";
}
/**
* @return textual name of this command
*
* @author Hakan Kjellerstrand (based on Klaus Meffert's Log file)
*/
public String getName() {
return "Sqrt";
}
public float execute_float(ProgramChromosome c, int n, Object[] args) {
float f = c.execute_float(n, 0, args);
return (float) Math.sqrt(Math.abs(f));
}
public double execute_double(ProgramChromosome c, int n, Object[] args) {
double d = c.execute_double(n, 0, args);
return Math.sqrt(Math.abs(d));
}
public Object execute_object(ProgramChromosome c, int n, Object[] args) {
return ( (Compatible) c.execute_object(n, 0, args)).execute_sqrt();
}
protected interface Compatible {
public Object execute_sqrt();
}
/**
* Clones the object. Simple and straight forward implementation here.
*
* @return cloned instance of this object
*
* @author Hakan Kjellerstrand (based on Klaus Meffert's Log file)
*/
public Object clone() {
try {
Sqrt result = new Sqrt(getGPConfiguration(), getReturnType());
return result;
} catch (Exception ex) {
throw new CloneException(ex);
}
}
}