ubic.basecode.math

Class RandomChooser

java.lang.Object

ubic.basecode.math.RandomChooser

public class RandomChooser
extends Object

Fill arrays with random values

Author:

Paul Pavlidis

Method Summary

Modifier and Type	Method and Description
static double[]	chooserandom(double[] sourcedata, int k) Random numbers from sourcedata, without replacement.
static int[]	chooserandom(int[] deck, int k) choose k random integers from 0 to max (exclusive) without repeating
static int[]	chooserandom(int max, int n) choose n random integers from 0 (inclusive) to max (exclusive) without repeating
static List<? extends Object>	chooserandom(List<? extends Object> source, int n)
static <T> Set<T>	chooseRandomSubset(int n, Collection<? extends T> superSet) Select a random subset of size n from collection superSet
static <T> Set<T>	chooseRandomSubset(int n, List<? extends T> superSet) Select a random subset of size n from List superSet
static int[]	chooserandomWrep(int max, int n) Same as chooserandom, but with replacement -- that is, repeats are allowed.
static void	init(long seed) Initialized the random number generator with a given seed.

Methods inherited from class java.lang.Object

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

Method Detail

chooserandom

public static double[] chooserandom(double[] sourcedata,
                                    int k)

Random numbers from sourcedata, without replacement.

Parameters:

sourcedata - Data to be randomly selected

deck - an array pre-filled with integers from 0 to max, but they don't have to be in order (just an optimization so we don't have to generate this multiple times)

k - how many values we need.

chooserandom

public static int[] chooserandom(int max,
                                 int n)

choose n random integers from 0 (inclusive) to max (exclusive) without repeating

Parameters:

max - largest value to choose

n - how many to choose

chooserandom

public static int[] chooserandom(int[] deck,
                                 int k)

choose k random integers from 0 to max (exclusive) without repeating

Parameters:

deck - an array pre-filled with integers from 0 to max, but they don't have to be in order. Provided to avoid recomputing in iterative computations.

k - how many to choose

chooserandom

public static List<? extends Object> chooserandom(List<? extends Object> source,
                                                  int n)

Parameters:

source -

n -

Returns:

sample without replacement

See Also:

RandomDataGenerator.nextSample

chooseRandomSubset

public static <T> Set<T> chooseRandomSubset(int n,
                                            Collection<? extends T> superSet)

Select a random subset of size n from collection superSet

Parameters:

n -

superSet -

Returns:

subset.

chooseRandomSubset

public static <T> Set<T> chooseRandomSubset(int n,
                                            List<? extends T> superSet)

Select a random subset of size n from List superSet

Parameters:

n -

superSet -

Returns:

subset

chooserandomWrep

public static int[] chooserandomWrep(int max,
                                     int n)

Same as chooserandom, but with replacement -- that is, repeats are allowed.

Parameters:

randomnums - int[]

max - int

n - int

init

public static void init(long seed)

Initialized the random number generator with a given seed.

Parameters:

seed -