uk.ac.ed.inf.utils.stats
Class UniformRandomUtils

java.lang.Object
  uk.ac.ed.inf.utils.stats.UniformRandomUtils

public class UniformRandomUtils
extends java.lang.Object

Utilities for extracting with uniform random distribution

Version:

29 Jun 2008

Author:

Luna De Ferrari luna.deferrari-at-ed.ac.uk

Constructor Summary

UniformRandomUtils()

Method Summary

static int	extractInteger(int size) Returns a random integer between 0 and (size-1)
static java.util.Map.Entry	extractUniformRandomMapEntry(java.util.Map map) Extracts a random entry (key-value association) from a map
static java.util.Map	getUniformRandomSubmap(java.util.Map map, double percentage) Returns a submap of randomly picked map entries

Methods inherited from class java.lang.Object

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

Constructor Detail

UniformRandomUtils

public UniformRandomUtils()

Method Detail

extractInteger

public static int extractInteger(int size)

Returns a random integer between 0 and (size-1)

Parameters:

size - size-1 is the biggest integer that can be extracted

Returns:

a random integer between 0 and (size-1)

extractUniformRandomMapEntry

public static java.util.Map.Entry extractUniformRandomMapEntry(java.util.Map map)

Extracts a random entry (key-value association) from a map

Parameters:

map - a map

Returns:

a random (uniform probability) entry from the map

getUniformRandomSubmap

public static java.util.Map getUniformRandomSubmap(java.util.Map map,
                                                   double percentage)

Returns a submap of randomly picked map entries

Parameters:

map - the original map

percentage - the percentage of the original map to be put in the submap

Returns:

the random submap