jebl.math
Class Random

java.lang.Object
  jebl.math.Random

public class Random
extends Object

Random number generation.

Author:

Matthew Goode, Alexei Drummond

Method Summary

static double[]	getNormalized(double[] array)
static double	getTotal(double[] array)
static double	getTotal(double[] array, int start, int end)
static boolean	nextBoolean() Access a default instance of this class, access is synchronized
static byte	nextByte() Access a default instance of this class, access is synchronized
static void	nextBytes(byte[] bs) Access a default instance of this class, access is synchronized
static char	nextChar() Access a default instance of this class, access is synchronized
static double	nextDouble() Access a default instance of this class, access is synchronized
static float	nextFloat() Access a default instance of this class, access is synchronized
static double	nextGaussian() Access a default instance of this class, access is synchronized
static int	nextInt() Access a default instance of this class, access is synchronized
static int	nextInt(int n) Access a default instance of this class, access is synchronized
static long	nextLong() Access a default instance of this class, access is synchronized
static short	nextShort() Access a default instance of this class, access is synchronized
static int	randomChoice(double[] cf)
static void	setSeed(long seed) Access a default instance of this class, access is synchronized
static void	shuffle(int[] array) Shuffles an array.
static void	shuffle(int[] array, int numberOfShuffles) Shuffles an array.
static int[]	shuffled(int l) Returns an array of shuffled indices of length l.

Methods inherited from class java.lang.Object

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

Method Detail

randomChoice

public static int randomChoice(double[] cf)

getNormalized

public static double[] getNormalized(double[] array)

Returns:

a new double array where all the values sum to 1. Relative ratios are preserved.

getTotal

public static double getTotal(double[] array,
                              int start,
                              int end)

Parameters:

end - the index of the element after the last one to be included

Returns:

the total of a the values in a range of an array

getTotal

public static double getTotal(double[] array)

Returns:

the total of the values in an array

setSeed

public static void setSeed(long seed)

Access a default instance of this class, access is synchronized

nextByte

public static byte nextByte()

Access a default instance of this class, access is synchronized

nextBoolean

public static boolean nextBoolean()

Access a default instance of this class, access is synchronized

nextBytes

public static void nextBytes(byte[] bs)

Access a default instance of this class, access is synchronized

nextChar

public static char nextChar()

Access a default instance of this class, access is synchronized

nextGaussian

public static double nextGaussian()

Access a default instance of this class, access is synchronized

nextDouble

public static double nextDouble()

Access a default instance of this class, access is synchronized

nextFloat

public static float nextFloat()

Access a default instance of this class, access is synchronized

nextLong

public static long nextLong()

Access a default instance of this class, access is synchronized

nextShort

public static short nextShort()

Access a default instance of this class, access is synchronized

nextInt

public static int nextInt()

Access a default instance of this class, access is synchronized

nextInt

public static int nextInt(int n)

Access a default instance of this class, access is synchronized

shuffle

public static void shuffle(int[] array)

Shuffles an array.

shuffle

public static void shuffle(int[] array,
                           int numberOfShuffles)

Shuffles an array. Shuffles numberOfShuffles times

shuffled

public static int[] shuffled(int l)

Returns an array of shuffled indices of length l.

Parameters:

l - length of the array required.