cern.jet.random.engine

Class RandomSeedGenerator

java.lang.Object

cern.colt.PersistentObject

cern.jet.random.engine.RandomSeedGenerator

All Implemented Interfaces:

Serializable, Cloneable

public class RandomSeedGenerator
extends PersistentObject

Deterministic seed generator for pseudo-random number generators. The sole purpose of this class is to decorrelate seeds and uniform random number generators. (If a generator would be used to generate seeds for itself, the result could be correlations.)

This class has entirelly deterministic behaviour: Constructing two instances with the same parameters at any two distinct points in time will produce identical seed sequences. However, it does not (at all) generate uniformly distributed numbers. Do not use it as a uniformly distributed random number generator!

Each generated sequence of seeds has a period of 10⁹ numbers. Internally uses RandomSeedTable.

Version:

1.0, 09/24/99

Author:

wolfgang.hoschek@cern.ch

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	column
protected int	row

Fields inherited from class cern.colt.PersistentObject

serialVersionUID

Constructor Summary

Constructors

Constructor and Description
RandomSeedGenerator() Constructs and returns a new seed generator.
RandomSeedGenerator(int row, int column) Constructs and returns a new seed generator; you normally won't need to use this method.

Method Summary

Methods

Modifier and Type	Method and Description
static void	main(String[] args) Prints the generated seeds for the given input parameters.
int	nextSeed() Returns the next seed.
void	print(int size) Prints the next size generated seeds.

Methods inherited from class cern.colt.PersistentObject

clone

Methods inherited from class java.lang.Object

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

Field Detail

row

protected int row

column

protected int column

Constructor Detail

RandomSeedGenerator

public RandomSeedGenerator()

Constructs and returns a new seed generator.

RandomSeedGenerator

public RandomSeedGenerator(int row,
                   int column)

Constructs and returns a new seed generator; you normally won't need to use this method.

The position [row,column] indicates the iteration starting point within a (virtual) seed matrix. The seed matrix is a n*m matrix with 1 + Integer.MAX_VALUE (virtual) rows and RandomSeedTable.COLUMNS columns. Successive calls to method nextSeed() will cycle over the given column, in ascending order: nextSeed() returns the seed s[row,column], s[row+1,column], ... s[Integer.MAX_VALUE,column], s[0,column], s[1,column], ...

Parameters:

row - should be in [0,Integer.MAX_VALUE].

column - should be in [0,RandomSeedTable.COLUMNS - 1].

Method Detail

main

public static void main(String[] args)

Prints the generated seeds for the given input parameters.

nextSeed

public int nextSeed()

Returns the next seed.

print

public void print(int size)

Prints the next size generated seeds.