| /* |
| * 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/LICENSE-2.0 |
| * |
| * 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.rng.core.source32; |
| |
| /** |
| * This class implements the WELL44497b pseudo-random 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 Long-Period 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/wellrng-errata.txt">wellrng-errata.txt</a>. |
| * </p> |
| * |
| * @see <a href="http://www.iro.umontreal.ca/~panneton/WELLRNG.html">WELL Random number generator</a> |
| * @since 1.0 |
| */ |
| public class Well44497b extends Well44497a { |
| /** |
| * Creates a new random number generator. |
| * |
| * @param seed Initial seed. |
| */ |
| public Well44497b(int[] seed) { |
| super(seed); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int next() { |
| int z4 = super.next(); |
| |
| // Matsumoto-Kurita tempering to get a maximally equidistributed generator. |
| z4 ^= (z4 << 7) & 0x93dd1400; |
| z4 ^= (z4 << 15) & 0xfa118000; |
| |
| return z4; |
| } |
| } |