com.groovyj.jgprog.functions
Class NaturalLogarithm

java.lang.Object
  |
  +--com.groovyj.jgprog.Function
        |
        +--com.groovyj.jgprog.functions.NaturalLogarithm

All Implemented Interfaces:

java.io.Serializable

public class NaturalLogarithm

extends Function

implements java.io.Serializable

The protected natural logarithm function. Allowed to be of type float or double. Its child is the argument and must be of the same type as this node.

If the argument is 0, the result is 0.

For float exponents, if the absolute result is greater than 1e10 then the result is clipped to +/-1e10.

For double exponents, if the absolute result is greater than 1e100 then the result is clipped to +/-1e100.

Copyright (c) 2000 Robert Baruch. This code is released under the GNU General Public License (GPL).

Version:

$Id: NaturalLogarithm.java,v 1.1 2000/10/12 15:19:39 groovyjava Exp $

Author:

Robert Baruch (jgprog@sourceforge.net)

See Also:

Serialized Form

Inner Class Summary

static interface

NaturalLogarithm.Compatible

Fields inherited from class com.groovyj.jgprog.Function

arity, individual, returnType

Constructor Summary

NaturalLogarithm(Type type)

Method Summary

double	execute_double(Chromosome c, int n) Executes this node as a double.
float	execute_float(Chromosome c, int n) Executes this node as a float.
java.lang.Object	execute_object(Chromosome c, int n) Executes this node as an object.
Type	getChildType(int i) Gets the type of node allowed form the given child number.
java.lang.String	getName() Gets the name of this node.

Methods inherited from class com.groovyj.jgprog.Function

execute_boolean, execute_int, execute_long, execute_void, execute, getArity, getReturnType, setIndividual, setReturnType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NaturalLogarithm

public NaturalLogarithm(Type type)

Method Detail

getName

public java.lang.String getName()

Description copied from class: Function

Gets the name of this node. Must be overridden in subclasses.

Overrides:

getName in class Function

Following copied from class: com.groovyj.jgprog.Function

Returns:

the name of this node.

execute_float

public float execute_float(Chromosome c,
                           int n)

Description copied from class: Function

Executes this node as a float.

Overrides:

execute_float in class Function

Following copied from class: com.groovyj.jgprog.Function

Returns:

the float return value of this node

Throws:

UnsupportedOperationException - if the type of this node is not float

execute_double

public double execute_double(Chromosome c,
                             int n)

Description copied from class: Function

Executes this node as a double.

Overrides:

execute_double in class Function

Following copied from class: com.groovyj.jgprog.Function

Returns:

the double return value of this node

Throws:

UnsupportedOperationException - if the type of this node is not double

getChildType

public Type getChildType(int i)

Description copied from class: Function

Gets the type of node allowed form the given child number. Must be overridden in subclasses.

Overrides:

getChildType in class Function

Following copied from class: com.groovyj.jgprog.Function

Parameters:

i - the child number

Returns:

the type of node allowed for that child

execute_object

public java.lang.Object execute_object(Chromosome c,
                                       int n)

Description copied from class: Function

Executes this node as an object.

Overrides:

execute_object in class Function

Following copied from class: com.groovyj.jgprog.Function

Returns:

the object return value of this node

Throws:

UnsupportedOperationException - if the type of this node is not object