Class 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
    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int COLUMNS
      The number of columns of the matrix (currently COLUMNS = 2).
      private static int[] seeds  
    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      protected RandomSeedTable()
      Makes this class non instantiable, but still let's others inherit from it.
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int getSeedAtRowColumn​(int row, int column)
      Returns a deterministic seed from a (seemingly gigantic) matrix of predefined seeds.
      private static int rows()
      Not yet commented.
      • 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
      • seeds

        private static final int[] seeds
    • 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.
      • rows

        private static int rows()
        Not yet commented.
        Returns:
        int