: Class ConstantDouble

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gpsys.primitives
Class ConstantDouble

java.lang.Object
  |
  +--gpsys.Primitive
        |
        +--gpsys.Terminal
              |
              +--gpsys.primitives.ConstantDouble

public class ConstantDouble
extends Terminal

	DOUBLE ConstantDouble

Creates a Terminal representing an ephemeral random constant of Type DOUBLE.

Version:: $Revision: 1.1 $, $Date: 2000/07/05 16:24:33 $
Author:: Adil Qureshi
Department of Computer Science,

University College London,

Gower St,

London WC1E 6BT,

UK.
See Also:: Type, Primitive, Terminal, Serialized Form

Field Summary
`double`	`d` The value of this constant.
`private double`	`from` The smallest value that this constant can take.
`private java.util.Random`	`rng` The random number generator used to create this constant.
`private double`	`to` The largest value that this constant can take.

Fields inherited from class gpsys.Primitive

type

Constructor Summary
`ConstantDouble(java.util.Random rng, double from, double to)` Create a ephemeral random constant of type double in the range between from and to using the random number generator rng.

Method Summary
`double`	`evaluateDouble(Individual i)` Evaluate this Terminal.
`Primitive`	`instance()` Creates a new DOUBLE constant in exactly the same range as this constant, and using the same random number generator.
`java.lang.String`	`toString()` Returns the value of the constant as a String.

Methods inherited from class gpsys.Terminal

evaluateBoolean, 
evaluateByte, 
evaluateChar, 
evaluateFloat, 
evaluateInt, 
evaluateLong, 
evaluateObject, 
evaluateShort

Methods inherited from class java.lang.Object

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

Field Detail

d

public double d

The value of this constant.

from

private double from

The smallest value that this constant can take.

to

private double to

The largest value that this constant can take.

rng

private java.util.Random rng

The random number generator used to create this constant.

Constructor Detail

ConstantDouble

public ConstantDouble(java.util.Random rng,
                      double from,
                      double to)

Create a ephemeral random constant of type double in the range between from and to using the random number generator rng.

Parameters:: rng - The random number generator to be used.; from - The smallest value that the constant can take.; to - The largest value that the constant can take.

Method Detail

evaluateDouble

public final double evaluateDouble(Individual i)
                            throws EvaluationException

Evaluate this Terminal.

Parameters:: i - The individual being evaluated.
Returns:: The value of the constant.
Throws:: EvaluationException - If there is an evaluation failure.
Overrides:: evaluateDouble in class Terminal

instance

public final Primitive instance()

Creates a new DOUBLE constant in exactly the same range as this constant, and using the same random number generator.

Returns:: A new DOUBLE constant in exactly the same range.
Overrides:: instance in class Primitive

toString

public java.lang.String toString()

Returns the value of the constant as a String.

Returns:: A String representing the value of this constant.
Overrides:: toString in class Primitive