WELL512
umontreal.iro.lecuyer.rng

Class WELL512

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


    public class WELL512extends 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, and which has a state size of 512 bits and a period length of approximatively 2512. The values of V, W and Z are 2150, 2200 and 2350 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.

    This implementation requires about 70K 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

      • WELL512

        public WELL512()
        Constructs a new stream.
      • WELL512

        public WELL512(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 WELL512 to the 16 integers of the vector seed[0..15]. This will be the initial seed of the class of the next created stream. At least one of the integers must be non-zero.
        Parameters:
        seed - array of 16 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..15]. 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 16 elements representing the seed
      • getState

        public int[] getState()
        Returns the current state of the stream, represented as an array of 16 integers.
        Returns:
        the current state of the stream
      • main

        public static void main(String[] args)
        This method is only meant to be used during the compilation process. It is used to create the resource file the class need in order to run.

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