cern.jet.random.engine
Class RandomSeedTable

java.lang.Object
  cern.jet.random.engine.RandomSeedTable

public class RandomSeedTable
extends java.lang.Object

(Seemingly gigantic) table of good seeds for pseudo-random number generators.

Implementation:

This is a port of SeedTable.h used in CLHEP 1.4.0 (C++). CLHEP's implementation, in turn, is part of GEANT 4, a C++ simulation toolkit for High Energy Physics. Geant4, in turn, took the table from the original FORTRAN77 implementation of the HEP CERN Library routine RECUSQ. Each sequence has a period of 10**9 numbers.

Version:

1.0, 09/24/99

Author:

wolfgang.hoschek@cern.ch

Field Summary

static int

COLUMNS The number of columns of the matrix (currently COLUMNS = 2).

Constructor Summary

protected

RandomSeedTable() Makes this class non instantiable, but still let's others inherit from it.

Method Summary

static int

getSeedAtRowColumn(int row, int column) Returns a deterministic seed from a (seemingly gigantic) matrix of predefined seeds.

Methods inherited from class java.lang.Object

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

Field Detail

COLUMNS

public static final int COLUMNS

The number of columns of the matrix (currently COLUMNS = 2).

See Also:

Constant Field Values

Constructor Detail

RandomSeedTable

protected RandomSeedTable()

Makes this class non instantiable, but still let's others inherit from it.

Method Detail

getSeedAtRowColumn

public static int getSeedAtRowColumn(int row,
                                     int column)

Returns a deterministic seed from a (seemingly gigantic) matrix of predefined seeds.

Parameters:

row - should (but need not) be in [0,Integer.MAX_VALUE].

column - shoould (but need not) be in [0,SeedTable.COLUMNS-1].

Returns:

the seed at the indicated matrix position.