Class RandomSeedGenerator

  extended by cern.colt.PersistentObject
      extended by cern.jet.random.engine.RandomSeedGenerator
All Implemented Interfaces:, java.lang.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.

See Also:
Serialized Form

Field Summary
protected  int column
protected  int row
Fields inherited from class cern.colt.PersistentObject
Constructor Summary
          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
static void main(java.lang.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
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


protected int row


protected int column
Constructor Detail


public RandomSeedGenerator()
Constructs and returns a new seed generator.


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], ...

row - should be in [0,Integer.MAX_VALUE].
column - should be in [0,RandomSeedTable.COLUMNS - 1].
Method Detail


public static void main(java.lang.String[] args)
Prints the generated seeds for the given input parameters.


public int nextSeed()
Returns the next seed.


public void print(int size)
Prints the next size generated seeds.