Class MersenneTwister64

All Implemented Interfaces:
RandomLongSource, RestorableUniformRandomProvider, UniformRandomProvider

public class MersenneTwister64 extends LongProvider
This class provides the 64-bits version of the originally 32-bits Mersenne Twister.

This class is mainly a Java port of the 2014/2/23 version of the generator written in C by Takuji Nishimura and Makoto Matsumoto.

Here is their original copyright:

Mersenne Twister licence
Copyright (C) 2004, Makoto Matsumoto and Takuji Nishimura, All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  3. The names of its contributors may not be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Since:
1.0
See Also:
  • Field Details

    • NN

      private static final int NN
      Size of the bytes pool.
      See Also:
    • MM

      private static final int MM
      Period second parameter.
      See Also:
    • MAG01

      private static final long[] MAG01
      X * MATRIX_A for X = {0, 1}.
    • UM

      private static final long UM
      Most significant 33 bits.
      See Also:
    • LM

      private static final long LM
      Least significant 31 bits.
      See Also:
    • mt

      private final long[] mt
      Bytes pool.
    • mti

      private int mti
      Current index in the bytes pool.
  • Constructor Details

    • MersenneTwister64

      public MersenneTwister64(long[] seed)
      Creates a new random number generator.
      Parameters:
      seed - Initial seed.
  • Method Details

    • getStateInternal

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

      protected void setStateInternal(byte[] s)
      Resets the RNG to the given state.
      Overrides:
      setStateInternal in class LongProvider
      Parameters:
      s - State (previously obtained by a call to BaseProvider.getStateInternal()).
      See Also:
    • setSeedInternal

      private void setSeedInternal(long[] inputSeed)
      Initializes the generator with the given seed.
      Parameters:
      inputSeed - Initial seed.
    • initState

      private void initState(long seed)
      Initialize the internal state of this instance.
      Parameters:
      seed - Seed.
    • next

      public long next()
      Returns:
      the next random value.