WELL607
umontreal.iro.lecuyer.rng

Class WELL607

  • All Implemented Interfaces:
    Serializable, Cloneable, CloneableRandomStream, RandomStream


    public class WELL607extends RandomStreamBase
    This class implements the RandomStream interface via inheritance from RandomStreamBase. The backbone generator is a Well Equidistributed Long period Linear Random Number Generator (WELL), proposed by F. Panneton. The implemented generator is the WELL607, which has a state size of 607 bits and a period length of approximatively 2607. The values of V, W and Z are 2150, 2250 and 2400 respectively (see RandomStream for their definition). The seed of the RNG, and the state of a stream at any given step, is a 19-dimensional vector of 32-bit integers. The output of nextValue has 32 bits of precision.

    This implementation requires the use of about 100K of memory to run. This memory is shared between all instances of the class, and is only loaded when the first instance is created.

    See Also:
    Serialized Form
    • Constructor Detail

      • WELL607

        public WELL607()
        Constructs a new stream.
      • WELL607

        public WELL607(String name)
        Constructs a new stream with the identifier name (used in the toString method).
        Parameters:
        name - name of the stream
    • Method Detail

      • setPackageSeed

        public static void setPackageSeed(int[] seed)
        Sets the initial seed of the class WELL607 to the 19 integers of the vector seed[0..18]. This will be the initial seed of the next created stream. At least one of the integers must not be zero and if this integer is the last one, it must not be equal to 0x80000000.
        Parameters:
        seed - array of 19 elements representing the seed
      • setSeed

        public void setSeed(int[] seed)
        This method is discouraged for normal use. Initializes the stream at the beginning of a stream with the initial seed seed[0..18]. The seed must satisfy the same conditions as in setPackageSeed. This method only affects the specified stream; the others are not modified. Hence after calling this method, the beginning of the streams will no longer be spaced Z values apart. For this reason, this method should only be used in very exceptional cases; proper use of the reset... methods and of the stream constructor is preferable.
        Parameters:
        seed - array of 19 elements representing the seed
      • getState

        public int[] getState()
        Returns the current state of the stream, represented as an array of 19 integers.
        Returns:
        the current state of the stream
      • clone

        public WELL607 clone()
        Clones the current generator and return its copy.
        Specified by:
        clone in interface CloneableRandomStream
        Returns:
        A deep copy of the current generator
      • main

        public static void main(String[] args)

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