Class AbstractXoRoShiRo1024

    • 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.
      • LONG_JUMP_COEFFICIENTS

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

        private final long[] state
        State.
      • index

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

      • AbstractXoRoShiRo1024

        AbstractXoRoShiRo1024​(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.
      • AbstractXoRoShiRo1024

        protected AbstractXoRoShiRo1024​(AbstractXoRoShiRo1024 source)
        Creates a copy instance.
        Parameters:
        source - Source to copy.
    • 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.
      • transform

        protected abstract long transform​(long s0,
                                          long s15)
        Transform the two consecutive 64-bit states of the generator to a 64-bit output. The transformation function shall vary with respect to different generators.
        Parameters:
        s0 - The current state.
        s15 - The previous state.
        Returns:
        the output
      • 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.
      • longJump

        public JumpableUniformRandomProvider longJump()
        Creates a copy of the JumpableUniformRandomProvider 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 long 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 long jump for use in parallel computations.

        The returned copy may be jumped m / n times before overlap with the current instance where m is the long jump length and n is the jump length of the JumpableUniformRandomProvider.jump() method.

        The jump size is the equivalent of 2768 calls to nextLong(). It can provide up to 2256 non-overlapping subsequences of length 2768; each subsequence can provide up to 2256 non-overlapping subsequences of length 2512 using the jump() method.

        Specified by:
        longJump in interface LongJumpableUniformRandomProvider
        Returns:
        A copy of the current state.
      • performJump

        private void performJump​(long[] jumpCoefficients)
        Perform the jump to advance the generator state. Resets the cached state of the generator.
        Parameters:
        jumpCoefficients - the jump coefficients