techniques.utils
Class Random

java.lang.Object
  |
  +--techniques.utils.Random

public class Random

extends Object

Constructor Summary

Random()

Method Summary

static boolean	coinFlip() Returns true with probability 0.5.
static int	random(int max) Returns uniformly a number between 0 and max-1 (inclusive)
static int	sampleCompleteProbDist(double[] prob) Samples from input based on given complete probability distribution (prob.
static int	samplePartialProbDist(double[] prob) Samples from input based on given probability distribution.

Methods inherited from class java.lang.Object

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

Constructor Detail

Random

public Random()

Method Detail

coinFlip

public static boolean coinFlip()

Returns true with probability 0.5.

random

public static int random(int max)

Returns uniformly a number between 0 and max-1 (inclusive)

sampleCompleteProbDist

public static int sampleCompleteProbDist(double[] prob)

Samples from input based on given complete probability distribution (prob. sum to 1).

Parameters:

prob - - array of probabilities (summing to 1)

Returns:

- value between 0 and prob.length (inclusive) based on uniform sampling of input prob

samplePartialProbDist

public static int samplePartialProbDist(double[] prob)

Samples from input based on given probability distribution. Is more flexible than sampleCompleteProbDist since the prob. dist. don't need to sum to 1, however, sampleCompleteProbDist includes an implicit error check.

Parameters:

prob - - array of probabilities

Returns:

- value between 0 and prob.length (inclusive) based on uniform sampling of input prob