WELL1024
umontreal.iro.lecuyer.rng

Class WELL1024

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


    public class WELL1024extends RandomStreamBase
    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, and which has a state size of 1024 bits and a period length of approximatively 21024. The values of V, W and Z are 2300, 2400 and 2700 respectively (see RandomStream for their definition). The seed of the RNG, and the state of a stream at any given step, is a 16-dimensional vector of 32-bit integers. The output of nextValue has 32 bits of precision.

    This implementation requires the use of about 250K 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

      • WELL1024

        public WELL1024()
        Constructs a new stream.
      • WELL1024

        public WELL1024(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 this class to the 32 integers of array seed[0..31]. This will be the initial seed of the class and of the next created stream. At least one of the integers must be non-zero.
        Parameters:
        seed - array of 32 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..31]. 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 32 elements representing the seed
      • getState

        public int[] getState()
        Returns the current state of the stream, represented as an array of 32 integers.
        Returns:
        the current state of the stream
      • main

        public static void main(String[] args)

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