# SuanShu, a Java numerical and statistical library

com.numericalmethod.suanshu.stats.random.rng.univariate.uniform.mersennetwister

## Class MersenneTwister

• java.lang.Object
• com.numericalmethod.suanshu.stats.random.rng.univariate.uniform.mersennetwister.MersenneTwister
• All Implemented Interfaces:
RandomLongGenerator, RandomNumberGenerator, Seedable

public class MersenneTwister
extends Object
implements RandomLongGenerator
Mersenne Twister is one of the best pseudo random number generators available. It was invented by Makoto Matsumoto and Takuji Nishimura in 1997. This implementation is the MT19937 version that produces uniformly 32-bit integers. It is by-and-large a Java translation of the 2002-01-26 version of the C by Makoto Matsumoto and Takuji Nishimura.

    A C-program for MT19937, with initialization improved 2002/1/26.
Coded by Takuji Nishimura and Makoto Matsumoto.

Before using, initialize the state by using init_genrand(seed)
or init_by_array(init_key, key_length).

Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,

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.

Any feedback is very welcome.
http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
email: m-mat@math.sci.hiroshima-u.ac.jp

• ### Constructor Summary

Constructors
Constructor and Description
MersenneTwister()
Constructs a random number generator to sample uniformly from [0, 1].
MersenneTwister(long... seeds)
Constructs a random number generator to sample uniformly from [0, 1].
MersenneTwister(MersenneTwisterParam param)
Constructs a new instance, which uses parameters and the state contained in the given MersenneTwisterParam instance.
MersenneTwister(MersenneTwisterParam param, long... seeds)
• ### Method Summary

All Methods
Modifier and Type Method and Description
double nextDouble()
Get the next random double.
long nextLong()
Get the next random long.
void seed(long... seeds)
Seed the random number/vector/scenario generator to produce repeatable experiments.
• ### Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### Constructor Detail

• #### MersenneTwister

public MersenneTwister()
Constructs a random number generator to sample uniformly from [0, 1].
• #### MersenneTwister

public MersenneTwister(long... seeds)
Constructs a random number generator to sample uniformly from [0, 1].
Parameters:
seeds - the seeds
• #### MersenneTwister

public MersenneTwister(MersenneTwisterParam param)
Constructs a new instance, which uses parameters and the state contained in the given MersenneTwisterParam instance.
Parameters:
param - the parameter for creating this instance
• #### MersenneTwister

public MersenneTwister(MersenneTwisterParam param,
long... seeds)
• ### Method Detail

• #### seed

public void seed(long... seeds)
Description copied from interface: Seedable
Seed the random number/vector/scenario generator to produce repeatable experiments.
Specified by:
seed in interface Seedable
Parameters:
seeds - the seeds
• #### nextLong

public long nextLong()
Description copied from interface: RandomLongGenerator
Get the next random long.
Specified by:
nextLong in interface RandomLongGenerator
Returns:
the next random long
• #### nextDouble

public double nextDouble()
Description copied from interface: RandomNumberGenerator
Get the next random double.
Specified by:
nextDouble in interface RandomNumberGenerator
Returns:
the next random number