

Java example source code file (Well1024a.java)
The Well1024a.java Java example source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.math3.random; /** This class implements the WELL1024a pseudorandom number generator * from François Panneton, Pierre L'Ecuyer and Makoto Matsumoto. * <p>This generator is described in a paper by François Panneton, * Pierre L'Ecuyer and Makoto Matsumoto <a * href="http://www.iro.umontreal.ca/~lecuyer/myftp/papers/wellrng.pdf">Improved * LongPeriod Generators Based on Linear Recurrences Modulo 2</a> ACM * Transactions on Mathematical Software, 32, 1 (2006). The errata for the paper * are in <a href="http://www.iro.umontreal.ca/~lecuyer/myftp/papers/wellrngerrata.txt">wellrngerrata.txt. * @see <a href="http://www.iro.umontreal.ca/~panneton/WELLRNG.html">WELL Random number generator * @since 2.2 */ public class Well1024a extends AbstractWell { /** Serializable version identifier. */ private static final long serialVersionUID = 5680173464174485492L; /** Number of bits in the pool. */ private static final int K = 1024; /** First parameter of the algorithm. */ private static final int M1 = 3; /** Second parameter of the algorithm. */ private static final int M2 = 24; /** Third parameter of the algorithm. */ private static final int M3 = 10; /** Creates a new random number generator. * <p>The instance is initialized using the current time as the * seed.</p> */ public Well1024a() { super(K, M1, M2, M3); } /** Creates a new random number generator using a single int seed. * @param seed the initial seed (32 bits integer) */ public Well1024a(int seed) { super(K, M1, M2, M3, seed); } /** Creates a new random number generator using an int array seed. * @param seed the initial seed (32 bits integers array), if null * the seed of the generator will be related to the current time */ public Well1024a(int[] seed) { super(K, M1, M2, M3, seed); } /** Creates a new random number generator using a single long seed. * @param seed the initial seed (64 bits integer) */ public Well1024a(long seed) { super(K, M1, M2, M3, seed); } /** {@inheritDoc} */ @Override protected int next(final int bits) { final int indexRm1 = iRm1[index]; final int v0 = v[index]; final int vM1 = v[i1[index]]; final int vM2 = v[i2[index]]; final int vM3 = v[i3[index]]; final int z0 = v[indexRm1]; final int z1 = v0 ^ (vM1 ^ (vM1 >>> 8)); final int z2 = (vM2 ^ (vM2 << 19)) ^ (vM3 ^ (vM3 << 14)); final int z3 = z1 ^ z2; final int z4 = (z0 ^ (z0 << 11)) ^ (z1 ^ (z1 << 7)) ^ (z2 ^ (z2 << 13)); v[index] = z3; v[indexRm1] = z4; index = indexRm1; return z4 >>> (32  bits); } } Other Java examples (source code examples)Here is a short list of links related to this Java Well1024a.java source code file: 
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