Class XorShift1024Star

    • Field Detail

      • SEED_SIZE

        private static final int SEED_SIZE
        Size of the state vector.
        See Also:
        Constant Field Values
      • JUMP_COEFFICIENTS

        private static final long[] JUMP_COEFFICIENTS
        The coefficients for the jump function.
      • state

        private final long[] state
        State.
      • multiplier

        private final long multiplier
        The multiplier for the XorShift1024 algorithm.
      • index

        private int index
        Index in "state" array.
    • Constructor Detail

      • XorShift1024Star

        public XorShift1024Star​(long[] seed)
        Creates a new instance.
        Parameters:
        seed - Initial seed. If the length is larger than 16, only the first 16 elements will be used; if smaller, the remaining elements will be automatically set. A seed containing all zeros will create a non-functional generator.
      • XorShift1024Star

        protected XorShift1024Star​(long[] seed,
                                   long multiplier)
        Creates a new instance.
        Parameters:
        seed - Initial seed. If the length is larger than 16, only the first 16 elements will be used; if smaller, the remaining elements will be automatically set. A seed containing all zeros will create a non-functional generator.
        multiplier - The multiplier for the XorShift1024 algorithm.
        Since:
        1.3
      • XorShift1024Star

        protected XorShift1024Star​(XorShift1024Star source)
        Creates a copy instance.
        Parameters:
        source - Source to copy.
        Since:
        1.3
    • Method Detail

      • getStateInternal

        protected byte[] getStateInternal()
        Creates a snapshot of the RNG state.
        Overrides:
        getStateInternal in class LongProvider
        Returns:
        the internal state.
      • setSeedInternal

        private void setSeedInternal​(long[] seed)
        Seeds the RNG.
        Parameters:
        seed - Seed.
      • next

        public long next()
        Specified by:
        next in interface RandomLongSource
        Returns:
        the next random value.
      • jump

        public UniformRandomProvider jump()
        Creates a copy of the UniformRandomProvider and then advances the state of the current instance. The copy is returned.

        The current state will be advanced in a single operation by the equivalent of a number of sequential calls to a method that updates the state of the provider. The size of the jump is implementation dependent.

        Repeat invocations of this method will create a series of generators that are uniformly spaced at intervals of the output sequence. Each generator provides non-overlapping output for the length of the jump for use in parallel computations.

        The jump size is the equivalent of 2512 calls to nextLong(). It can provide up to 2512 non-overlapping subsequences.

        Specified by:
        jump in interface JumpableUniformRandomProvider
        Returns:
        A copy of the current state.
        Since:
        1.3
      • copy

        protected XorShift1024Star copy()
        Create a copy.
        Returns:
        the copy
        Since:
        1.3
      • performJump

        private void performJump()
        Perform the jump to advance the generator state. Resets the cached state of the generator.