third party library: apache-commons-mathandroid-cts-6.0_r9android-cts-6.0_r8android-cts-6.0_r7android-cts-6.0_r6android-cts-6.0_r5android-cts-6.0_r4android-cts-6.0_r32android-cts-6.0_r31android-cts-6.0_r30android-cts-6.0_r3android-cts-6.0_r29android-cts-6.0_r28android-cts-6.0_r27android-cts-6.0_r26android-cts-6.0_r25android-cts-6.0_r24android-cts-6.0_r23android-cts-6.0_r22android-cts-6.0_r21android-cts-6.0_r20android-cts-6.0_r2android-cts-6.0_r19android-cts-6.0_r18android-cts-6.0_r17android-cts-6.0_r16android-cts-6.0_r15android-cts-6.0_r14android-cts-6.0_r13android-cts-6.0_r12android-cts-6.0_r1android-6.0.1_r9android-6.0.1_r81android-6.0.1_r80android-6.0.1_r8android-6.0.1_r79android-6.0.1_r78android-6.0.1_r77android-6.0.1_r74android-6.0.1_r73android-6.0.1_r72android-6.0.1_r70android-6.0.1_r7android-6.0.1_r69android-6.0.1_r68android-6.0.1_r67android-6.0.1_r66android-6.0.1_r65android-6.0.1_r63android-6.0.1_r62android-6.0.1_r61android-6.0.1_r60android-6.0.1_r59android-6.0.1_r58android-6.0.1_r57android-6.0.1_r56android-6.0.1_r55android-6.0.1_r54android-6.0.1_r53android-6.0.1_r52android-6.0.1_r51android-6.0.1_r50android-6.0.1_r5android-6.0.1_r49android-6.0.1_r48android-6.0.1_r47android-6.0.1_r46android-6.0.1_r45android-6.0.1_r43android-6.0.1_r42android-6.0.1_r41android-6.0.1_r40android-6.0.1_r4android-6.0.1_r33android-6.0.1_r32android-6.0.1_r31android-6.0.1_r30android-6.0.1_r3android-6.0.1_r28android-6.0.1_r27android-6.0.1_r26android-6.0.1_r25android-6.0.1_r24android-6.0.1_r22android-6.0.1_r21android-6.0.1_r20android-6.0.1_r18android-6.0.1_r17android-6.0.1_r16android-6.0.1_r13android-6.0.1_r12android-6.0.1_r11android-6.0.1_r10android-6.0.1_r1android-6.0.0_r7android-6.0.0_r6android-6.0.0_r5android-6.0.0_r41android-6.0.0_r4android-6.0.0_r3android-6.0.0_r26android-6.0.0_r25android-6.0.0_r24android-6.0.0_r23android-6.0.0_r2android-6.0.0_r13android-6.0.0_r12android-6.0.0_r11android-6.0.0_r1marshmallow-releasemarshmallow-mr3-releasemarshmallow-mr2-releasemarshmallow-mr1-releasemarshmallow-mr1-devmarshmallow-dr1.6-releasemarshmallow-dr1.5-releasemarshmallow-dr1.5-devmarshmallow-dr-releasemarshmallow-dr-dragon-releasemarshmallow-dr-devmarshmallow-devmarshmallow-cts-release

Change-Id: I52a325624a7f0dd652b362a9840626d6d9f3c42b

1 files changed, 119 insertions, 0 deletions

diff --git a/src/main/java/org/apache/commons/math/random/Well44497b.java b/src/main/java/org/apache/commons/math/random/Well44497b.java
new file mode 100644
index 0000000..28b5dbb
--- /dev/null
+++ b/src/main/java/org/apache/commons/math/random/Well44497b.java
@@ -0,0 +1,119 @@
+/*
+ * 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.math.random;
+
+
+/** 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 Fran&ccedil;ois 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>
+ * @version $Revision: 1003892 $ $Date: 2010-10-02 23:28:56 +0200 (sam. 02 oct. 2010) $
+ * @since 2.2
+
+ */
+public class Well44497b extends AbstractWell {
+
+    /** Serializable version identifier. */
+    private static final long serialVersionUID = 4032007538246675492L;
+
+    /** Number of bits in the pool. */
+    private static final int K = 44497;
+
+    /** First parameter of the algorithm. */
+    private static final int M1 = 23;
+
+    /** Second parameter of the algorithm. */
+    private static final int M2 = 481;
+
+    /** Third parameter of the algorithm. */
+    private static final int M3 = 229;
+
+    /** Creates a new random number generator.
+     * <p>The instance is initialized using the current time as the
+     * seed.</p>
+     */
+    public Well44497b() {
+        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 Well44497b(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 Well44497b(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 Well44497b(long seed) {
+        super(K, M1, M2, M3, seed);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected int next(final int bits) {
+
+        // compute raw value given by WELL44497a generator
+        // which is NOT maximally-equidistributed
+        final int indexRm1 = iRm1[index];
+        final int indexRm2 = iRm2[index];
+
+        final int v0       = v[index];
+        final int vM1      = v[i1[index]];
+        final int vM2      = v[i2[index]];
+        final int vM3      = v[i3[index]];
+
+        // the values below include the errata of the original article
+        final int z0       = (0xFFFF8000 & v[indexRm1]) ^ (0x00007FFF & v[indexRm2]);
+        final int z1       = (v0 ^ (v0 << 24))  ^ (vM1 ^ (vM1 >>> 30));
+        final int z2       = (vM2 ^ (vM2 << 10)) ^ (vM3 << 26);
+        final int z3       = z1      ^ z2;
+        final int z2Prime  = ((z2 << 9) ^ (z2 >>> 23)) & 0xfbffffff;
+        final int z2Second = ((z2 & 0x00020000) != 0) ? (z2Prime ^ 0xb729fcec) : z2Prime;
+        int z4             = z0 ^ (z1 ^ (z1 >>> 20)) ^ z2Second ^ z3;
+
+        v[index]     = z3;
+        v[indexRm1]  = z4;
+        v[indexRm2] &= 0xFFFF8000;
+        index        = indexRm1;
+
+        // add Matsumoto-Kurita tempering
+        // to get a maximally-equidistributed generator
+        z4 = z4 ^ ((z4 <<  7) & 0x93dd1400);
+        z4 = z4 ^ ((z4 << 15) & 0xfa118000);
+
+        return z4 >>> (32 - bits);
+
+    }
+
+}