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<div class="subTitle">org.apache.commons.math3.random</div>
<h2 title="Class MersenneTwister" class="title">Class MersenneTwister</h2>
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<li><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">org.apache.commons.math3.random.BitsStreamGenerator</a></li>
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<pre>public class <span class="strong">MersenneTwister</span>
extends <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">BitsStreamGenerator</a>
implements <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
<div class="block">This class implements a powerful pseudo-random number generator
developed by Makoto Matsumoto and Takuji Nishimura during
1996-1997.
<p>This generator features an extremely long period
(2<sup>19937</sup>-1) and 623-dimensional equidistribution up to 32
bits accuracy. The home page for this generator is located at <a
href="http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html">
http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html</a>.</p>
<p>This generator is described in a paper by Makoto Matsumoto and
Takuji Nishimura in 1998: <a
href="http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/ARTICLES/mt.pdf">Mersenne
Twister: A 623-Dimensionally Equidistributed Uniform Pseudo-Random
Number Generator</a>, ACM Transactions on Modeling and Computer
Simulation, Vol. 8, No. 1, January 1998, pp 3--30</p>
<p>This class is mainly a Java port of the 2002-01-26 version of
the generator written in C by Makoto Matsumoto and Takuji
Nishimura. Here is their original copyright:</p>
<table border="0" width="80%" cellpadding="10" align="center" bgcolor="#E0E0E0">
<tr><td>Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
All rights reserved.</td></tr>
<tr><td>Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
<ol>
<li>Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.</li>
<li>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.</li>
<li>The names of its contributors may not be used to endorse or promote
products derived from this software without specific prior written
permission.</li>
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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.</strong></td></tr>
</table></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../serialized-form.html#org.apache.commons.math3.random.MersenneTwister">Serialized Form</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#MersenneTwister()">MersenneTwister</a></strong>()</code>
<div class="block">Creates a new random number generator.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#MersenneTwister(int)">MersenneTwister</a></strong>(int seed)</code>
<div class="block">Creates a new random number generator using a single int seed.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#MersenneTwister(int[])">MersenneTwister</a></strong>(int[] seed)</code>
<div class="block">Creates a new random number generator using an int array seed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#MersenneTwister(long)">MersenneTwister</a></strong>(long seed)</code>
<div class="block">Creates a new random number generator using a single long seed.</div>
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<td class="colFirst"><code>protected int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#next(int)">next</a></strong>(int bits)</code>
<div class="block">Generate next pseudorandom number.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#setSeed(int)">setSeed</a></strong>(int seed)</code>
<div class="block">Reinitialize the generator as if just built with the given int seed.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#setSeed(int[])">setSeed</a></strong>(int[] seed)</code>
<div class="block">Reinitialize the generator as if just built with the given int array seed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#setSeed(long)">setSeed</a></strong>(long seed)</code>
<div class="block">Reinitialize the generator as if just built with the given long seed.</div>
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<h3>Methods inherited from class org.apache.commons.math3.random.<a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">BitsStreamGenerator</a></h3>
<code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#clear()">clear</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextBoolean()">nextBoolean</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextBytes(byte[])">nextBytes</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextBytes(byte[],%20int,%20int)">nextBytes</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextDouble()">nextDouble</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextFloat()">nextFloat</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextGaussian()">nextGaussian</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextInt()">nextInt</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextInt(int)">nextInt</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextLong()">nextLong</a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextLong(long)">nextLong</a></code></li>
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<h4>MersenneTwister</h4>
<pre>public MersenneTwister()</pre>
<div class="block">Creates a new random number generator.
<p>The instance is initialized using the current time plus the
system identity hash code of this instance as the seed.</p></div>
</li>
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<h4>MersenneTwister</h4>
<pre>public MersenneTwister(int seed)</pre>
<div class="block">Creates a new random number generator using a single int seed.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>seed</code> - the initial seed (32 bits integer)</dd></dl>
</li>
</ul>
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<h4>MersenneTwister</h4>
<pre>public MersenneTwister(int[] seed)</pre>
<div class="block">Creates a new random number generator using an int array seed.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>seed</code> - the initial seed (32 bits integers array), if null
the seed of the generator will be related to the current time</dd></dl>
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<h4>MersenneTwister</h4>
<pre>public MersenneTwister(long seed)</pre>
<div class="block">Creates a new random number generator using a single long seed.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>seed</code> - the initial seed (64 bits integer)</dd></dl>
</li>
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<h4>setSeed</h4>
<pre>public void setSeed(int seed)</pre>
<div class="block">Reinitialize the generator as if just built with the given int seed.
<p>The state of the generator is exactly the same as a new
generator built with the same seed.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html#setSeed(int)">setSeed</a></code> in interface <code><a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#setSeed(int)">setSeed</a></code> in class <code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">BitsStreamGenerator</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>seed</code> - the initial seed (32 bits integer)</dd></dl>
</li>
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<a name="setSeed(int[])">
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<h4>setSeed</h4>
<pre>public void setSeed(int[] seed)</pre>
<div class="block">Reinitialize the generator as if just built with the given int array seed.
<p>The state of the generator is exactly the same as a new
generator built with the same seed.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html#setSeed(int[])">setSeed</a></code> in interface <code><a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#setSeed(int[])">setSeed</a></code> in class <code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">BitsStreamGenerator</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>seed</code> - the initial seed (32 bits integers array), if null
the seed of the generator will be the current system time plus the
system identity hash code of this instance</dd></dl>
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<h4>setSeed</h4>
<pre>public void setSeed(long seed)</pre>
<div class="block">Reinitialize the generator as if just built with the given long seed.
<p>The state of the generator is exactly the same as a new
generator built with the same seed.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html#setSeed(long)">setSeed</a></code> in interface <code><a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#setSeed(long)">setSeed</a></code> in class <code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">BitsStreamGenerator</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>seed</code> - the initial seed (64 bits integer)</dd></dl>
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<h4>next</h4>
<pre>protected int next(int bits)</pre>
<div class="block">Generate next pseudorandom number.
<p>This method is the core generation algorithm. It is used by all the
public generation methods for the various primitive types <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextBoolean()"><code>BitsStreamGenerator.nextBoolean()</code></a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextBytes(byte[])"><code>BitsStreamGenerator.nextBytes(byte[])</code></a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextDouble()"><code>BitsStreamGenerator.nextDouble()</code></a>,
<a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextFloat()"><code>BitsStreamGenerator.nextFloat()</code></a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextGaussian()"><code>BitsStreamGenerator.nextGaussian()</code></a>, <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextInt()"><code>BitsStreamGenerator.nextInt()</code></a>,
<a href="../../../../../org/apache/commons/math3/random/MersenneTwister.html#next(int)"><code>next(int)</code></a> and <a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#nextLong()"><code>BitsStreamGenerator.nextLong()</code></a>.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html#next(int)">next</a></code> in class <code><a href="../../../../../org/apache/commons/math3/random/BitsStreamGenerator.html" title="class in org.apache.commons.math3.random">BitsStreamGenerator</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>bits</code> - number of random bits to produce</dd>
<dt><span class="strong">Returns:</span></dt><dd>random bits generated</dd></dl>
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