physis.core.random
Class Randomness

java.lang.Object
  |
  +--physis.core.random.Randomness

Direct Known Subclasses:

JavaUtilRandom, MersenneTwister

public abstract class Randomness

extends java.lang.Object

class Randomness - a very plain boring name for basically a random number generator abstraction layer. Which I use for all of my evolutionary computation work. The past and the future are entirely contained in the present. -Ivar Ekeland, Mathematics and the Unexpected. 1988 Wed 30-May-2001 23:34 bush {Ghost Machine Industries}

Constructor Summary

Randomness(long seed)

Method Summary

abstract int	next(int bits) To extend this class, all you need to do is implement this method!
boolean	nextBoolean()
boolean	nextBoolean(double probability) This generates a coin flip with a probability probability of returning true, else returning false.
byte	nextByte()
void	nextBytes(byte[] bytes) A bug fix for all versions of the JDK.
double	nextDouble()
float	nextFloat()
int	nextInt() Returns a 32 bit uniformly distributed random number in the closed interval [Integer.MIN_VALUE,Integer.MAX_VALUE] (including Integer.MIN_VALUE and Integer.MAX_VALUE).
int	nextInt(int n)
long	nextLong() Returns a 64 bit uniformly distributed random number in the closed interval [Long.MIN_VALUE,Long.MAX_VALUE] (including Long.MIN_VALUE and Long.MAX_VALUE).
double	raw() Returns a 32 bit uniformly distributed random number in the open unit interval (0.0,1.0) (excluding 0.0 and 1.0).

Methods inherited from class java.lang.Object

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

Constructor Detail

Randomness

public Randomness(long seed)

Method Detail

nextInt

public final int nextInt()

Returns a 32 bit uniformly distributed random number in the closed interval [Integer.MIN_VALUE,Integer.MAX_VALUE] (including Integer.MIN_VALUE and Integer.MAX_VALUE).

nextInt

public final int nextInt(int n)

next

public abstract int next(int bits)

To extend this class, all you need to do is implement this method!

nextLong

public final long nextLong()

Returns a 64 bit uniformly distributed random number in the closed interval [Long.MIN_VALUE,Long.MAX_VALUE] (including Long.MIN_VALUE and Long.MAX_VALUE).

nextDouble

public final double nextDouble()

nextFloat

public final float nextFloat()

nextBytes

public final void nextBytes(byte[] bytes)

A bug fix for all versions of the JDK. The JDK appears to use all four bytes in an integer as independent byte values! Totally wrong.

nextByte

public final byte nextByte()

nextBoolean

public final boolean nextBoolean()

nextBoolean

public final boolean nextBoolean(double probability)

This generates a coin flip with a probability probability of returning true, else returning false. probability must be between 0.0 and 1.0, inclusive.

raw

public final double raw()

Returns a 32 bit uniformly distributed random number in the open unit interval (0.0,1.0) (excluding 0.0 and 1.0).