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Java example source code file (MersenneTwisterTest.java)

This example Java source code file (MersenneTwisterTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

mersennetwister, mersennetwistertest, override, randomgeneratorabstracttest

The MersenneTwisterTest.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/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.math3.random;

import org.junit.Assert;
import org.junit.Test;

public class MersenneTwisterTest extends RandomGeneratorAbstractTest {

    @Override
    protected RandomGenerator makeGenerator() {
        return new MersenneTwister(111);
    }

    // TODO: Some of the tests moved up to RandomGeneratorAbstractTest tested alternative seeding / constructors
    // Tests exercising these features directly should be added to this class.

    @Test
    public void testMakotoNishimura() {
        MersenneTwister mt = new MersenneTwister(new int[] {0x123, 0x234, 0x345, 0x456});
        long[] refInt = {
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            810200273l, 2591290167l, 2560260675l, 3242736208l,  646746669l, 1479517882l, 4245472273l, 1143372638l,
            3863670494l, 3221021970l, 1773610557l, 1138697238l, 1421897700l, 1269916527l, 2859934041l, 1764463362l,
            3874892047l, 3965319921l,   72549643l, 2383988930l, 2600218693l, 3237492380l, 2792901476l,  725331109l,
            605841842l,  271258942l,  715137098l, 3297999536l, 1322965544l, 4229579109l, 1395091102l, 3735697720l,
            2101727825l, 3730287744l, 2950434330l, 1661921839l, 2895579582l, 2370511479l, 1004092106l, 2247096681l,
            2111242379l, 3237345263l, 4082424759l,  219785033l, 2454039889l, 3709582971l,  835606218l, 2411949883l,
            2735205030l,  756421180l, 2175209704l, 1873865952l, 2762534237l, 4161807854l, 3351099340l,  181129879l,
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            3140569849l, 2579909222l, 3794857471l,  900758066l, 2887199683l, 1720257997l, 3367494931l, 2668921229l,
            955539029l, 3818726432l, 1105704962l, 3889207255l, 2277369307l, 2746484505l, 1761846513l, 2413916784l,
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            1124182256l,   92039808l, 2126345552l,  425973257l,  386287896l, 2589870191l, 1987762798l, 4084826973l,
            2172456685l, 3366583455l, 3602966653l, 2378803535l, 2901764433l, 3716929006l, 3710159000l, 2653449155l,
            3469742630l, 3096444476l, 3932564653l, 2595257433l,  318974657l, 3146202484l,  853571438l,  144400272l,
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            3614810992l, 1610021185l, 1785757066l,  851346168l, 3761148643l, 2918835642l, 3364422385l, 3012284466l,
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        };
        double[] refDouble = {
            0.76275443, 0.99000644, 0.98670464, 0.10143112, 0.27933125, 0.69867227, 0.94218740, 0.03427201,
            0.78842173, 0.28180608, 0.92179002, 0.20785655, 0.54534773, 0.69644020, 0.38107718, 0.23978165,
            0.65286910, 0.07514568, 0.22765211, 0.94872929, 0.74557914, 0.62664415, 0.54708246, 0.90959343,
            0.42043116, 0.86334511, 0.19189126, 0.14718544, 0.70259889, 0.63426346, 0.77408121, 0.04531601,
            0.04605807, 0.88595519, 0.69398270, 0.05377184, 0.61711170, 0.05565708, 0.10133577, 0.41500776,
            0.91810699, 0.22320679, 0.23353705, 0.92871862, 0.98897234, 0.19786706, 0.80558809, 0.06961067,
            0.55840445, 0.90479405, 0.63288060, 0.95009721, 0.54948447, 0.20645042, 0.45000959, 0.87050869,
            0.70806991, 0.19406895, 0.79286390, 0.49332866, 0.78483914, 0.75145146, 0.12341941, 0.42030252,
            0.16728160, 0.59906494, 0.37575460, 0.97815160, 0.39815952, 0.43595080, 0.04952478, 0.33917805,
            0.76509902, 0.61034321, 0.90654701, 0.92915732, 0.85365931, 0.18812377, 0.65913428, 0.28814566,
            0.59476081, 0.27835931, 0.60722542, 0.68310435, 0.69387186, 0.03699800, 0.65897714, 0.17527003,
            0.02889304, 0.86777366, 0.12352068, 0.91439461, 0.32022990, 0.44445731, 0.34903686, 0.74639273,
            0.65918367, 0.92492794, 0.31872642, 0.77749724, 0.85413832, 0.76385624, 0.32744211, 0.91326300,
            0.27458185, 0.22190155, 0.19865383, 0.31227402, 0.85321225, 0.84243342, 0.78544200, 0.71854080,
            0.92503892, 0.82703064, 0.88306297, 0.47284073, 0.70059042, 0.48003761, 0.38671694, 0.60465770,
            0.41747204, 0.47163243, 0.72750808, 0.65830223, 0.10955369, 0.64215401, 0.23456345, 0.95944940,
            0.72822249, 0.40888451, 0.69980355, 0.26677428, 0.57333635, 0.39791582, 0.85377858, 0.76962816,
            0.72004885, 0.90903087, 0.51376506, 0.37732665, 0.12691640, 0.71249738, 0.81217908, 0.37037313,
            0.32772374, 0.14238259, 0.05614811, 0.74363008, 0.39773267, 0.94859135, 0.31452454, 0.11730313,
            0.62962618, 0.33334237, 0.45547255, 0.10089665, 0.56550662, 0.60539371, 0.16027624, 0.13245301,
            0.60959939, 0.04671662, 0.99356286, 0.57660859, 0.40269560, 0.45274629, 0.06699735, 0.85064246,
            0.87742744, 0.54508392, 0.87242982, 0.29321385, 0.67660627, 0.68230715, 0.79052073, 0.48592054,
            0.25186266, 0.93769755, 0.28565487, 0.47219067, 0.99054882, 0.13155240, 0.47110470, 0.98556600,
            0.84397623, 0.12875246, 0.90953202, 0.49129015, 0.23792727, 0.79481194, 0.44337770, 0.96564297,
            0.67749118, 0.55684872, 0.27286897, 0.79538393, 0.61965356, 0.22487929, 0.02226018, 0.49248200,
            0.42247006, 0.91797788, 0.99250134, 0.23449967, 0.52531508, 0.10246337, 0.78685622, 0.34310922,
            0.89892996, 0.40454552, 0.68608407, 0.30752487, 0.83601319, 0.54956031, 0.63777550, 0.82199797,
            0.24890696, 0.48801123, 0.48661910, 0.51223987, 0.32969635, 0.31075073, 0.21393155, 0.73453207,
            0.15565705, 0.58584522, 0.28976728, 0.97621478, 0.61498701, 0.23891470, 0.28518540, 0.46809591,
            0.18371914, 0.37597910, 0.13492176, 0.66849449, 0.82811466, 0.56240330, 0.37548956, 0.27562998,
            0.27521910, 0.74096121, 0.77176757, 0.13748143, 0.99747138, 0.92504502, 0.09175241, 0.21389176,
            0.21766512, 0.31183245, 0.23271221, 0.21207367, 0.57903312, 0.77523344, 0.13242613, 0.31037988,
            0.01204835, 0.71652949, 0.84487594, 0.14982178, 0.57423142, 0.45677888, 0.48420169, 0.53465428,
            0.52667473, 0.46880526, 0.49849733, 0.05670710, 0.79022476, 0.03872047, 0.21697212, 0.20443086,
            0.28949326, 0.81678186, 0.87629474, 0.92297064, 0.27373097, 0.84625273, 0.51505586, 0.00582792,
            0.33295971, 0.91848412, 0.92537226, 0.91760033, 0.07541125, 0.71745848, 0.61158698, 0.00941650,
            0.03135554, 0.71527471, 0.24821915, 0.63636652, 0.86159918, 0.26450229, 0.60160194, 0.35557725,
            0.24477500, 0.07186456, 0.51757096, 0.62120362, 0.97981062, 0.69954667, 0.21065616, 0.13382753,
            0.27693186, 0.59644095, 0.71500764, 0.04110751, 0.95730081, 0.91600724, 0.47704678, 0.26183479,
            0.34706971, 0.07545431, 0.29398385, 0.93236070, 0.60486023, 0.48015011, 0.08870451, 0.45548581,
            0.91872718, 0.38142712, 0.10668643, 0.01397541, 0.04520355, 0.93822273, 0.18011940, 0.57577277,
            0.91427606, 0.30911399, 0.95853475, 0.23611214, 0.69619891, 0.69601980, 0.76765372, 0.58515930,
            0.49479057, 0.11288752, 0.97187699, 0.32095365, 0.57563608, 0.40760618, 0.78703383, 0.43261152,
            0.90877651, 0.84686346, 0.10599030, 0.72872803, 0.19315490, 0.66152912, 0.10210518, 0.06257876,
            0.47950688, 0.47062066, 0.72701157, 0.48915116, 0.66110261, 0.60170685, 0.24516994, 0.12726050,
            0.03451185, 0.90864994, 0.83494878, 0.94800035, 0.91035206, 0.14480751, 0.88458997, 0.53498312,
            0.15963215, 0.55378627, 0.35171349, 0.28719791, 0.09097957, 0.00667896, 0.32309622, 0.87561479,
            0.42534520, 0.91748977, 0.73908457, 0.41793223, 0.99279792, 0.87908370, 0.28458072, 0.59132853,
            0.98672190, 0.28547393, 0.09452165, 0.89910674, 0.53681109, 0.37931425, 0.62683489, 0.56609740,
            0.24801549, 0.52948179, 0.98328855, 0.66403523, 0.55523786, 0.75886666, 0.84784685, 0.86829981,
            0.71448906, 0.84670080, 0.43922919, 0.20771016, 0.64157936, 0.25664246, 0.73055695, 0.86395782,
            0.65852932, 0.99061803, 0.40280575, 0.39146298, 0.07291005, 0.97200603, 0.20555729, 0.59616495,
            0.08138254, 0.45796388, 0.33681125, 0.33989127, 0.18717090, 0.53545811, 0.60550838, 0.86520709,
            0.34290701, 0.72743276, 0.73023855, 0.34195926, 0.65019733, 0.02765254, 0.72575740, 0.32709576,
            0.03420866, 0.26061893, 0.56997511, 0.28439072, 0.84422744, 0.77637570, 0.55982168, 0.06720327,
            0.58449067, 0.71657369, 0.15819609, 0.58042821, 0.07947911, 0.40193792, 0.11376012, 0.88762938,
            0.67532159, 0.71223735, 0.27829114, 0.04806073, 0.21144026, 0.58830274, 0.04140071, 0.43215628,
            0.12952729, 0.94668759, 0.87391019, 0.98382450, 0.27750768, 0.90849647, 0.90962737, 0.59269720,
            0.96102026, 0.49544979, 0.32007095, 0.62585546, 0.03119821, 0.85953001, 0.22017528, 0.05834068,
            0.80731217, 0.53799961, 0.74166948, 0.77426600, 0.43938444, 0.54862081, 0.58575513, 0.15886492,
            0.73214332, 0.11649057, 0.77463977, 0.85788827, 0.17061997, 0.66838056, 0.96076133, 0.07949296,
            0.68521946, 0.89986254, 0.05667410, 0.12741385, 0.83470977, 0.63969104, 0.46612929, 0.10200126,
            0.01194925, 0.10476340, 0.90285217, 0.31221221, 0.32980614, 0.46041971, 0.52024973, 0.05425470,
            0.28330912, 0.60426543, 0.00598243, 0.97244013, 0.21135841, 0.78561597, 0.78428734, 0.63422849,
            0.32909934, 0.44771136, 0.27380750, 0.14966697, 0.18156268, 0.65686758, 0.28726350, 0.97074787,
            0.63676171, 0.96649494, 0.24526295, 0.08297372, 0.54257548, 0.03166785, 0.33735355, 0.15946671,
            0.02102971, 0.46228045, 0.11892296, 0.33408336, 0.29875681, 0.29847692, 0.73767569, 0.02080745,
            0.62980060, 0.08082293, 0.22993106, 0.25031439, 0.87787525, 0.45150053, 0.13673441, 0.63407612,
            0.97907688, 0.52241942, 0.50580158, 0.06273902, 0.05270283, 0.77031811, 0.05113352, 0.24393329,
            0.75036441, 0.37436336, 0.22877652, 0.59975358, 0.85707591, 0.88691457, 0.85547165, 0.36641027,
            0.58720133, 0.45462835, 0.09243817, 0.32981586, 0.07820411, 0.25421519, 0.36004706, 0.60092307,
            0.46192412, 0.36758683, 0.98424170, 0.08019934, 0.68594024, 0.45826386, 0.29962317, 0.79365413,
            0.89231296, 0.49478547, 0.87645944, 0.23590734, 0.28106737, 0.75026285, 0.08136314, 0.79582424,
            0.76010628, 0.82792971, 0.27947652, 0.72482861, 0.82191216, 0.46171689, 0.79189752, 0.96043686,
            0.51609668, 0.88995725, 0.28998963, 0.55191845, 0.03934737, 0.83033700, 0.49553013, 0.98009549,
            0.19017594, 0.98347750, 0.33452066, 0.87144372, 0.72106301, 0.71272114, 0.71465963, 0.88361677,
            0.85571283, 0.73782329, 0.20920458, 0.34855153, 0.46766817, 0.02780062, 0.74898344, 0.03680650,
            0.44866557, 0.77426312, 0.91025891, 0.25195236, 0.87319953, 0.63265037, 0.25552148, 0.27422476,
            0.95217406, 0.39281839, 0.66441573, 0.09158900, 0.94515992, 0.07800798, 0.02507888, 0.39901462,
            0.17382573, 0.12141278, 0.85502334, 0.19902911, 0.02160210, 0.44460522, 0.14688742, 0.68020336,
            0.71323733, 0.60922473, 0.95400380, 0.99611159, 0.90897777, 0.41073520, 0.66206647, 0.32064685,
            0.62805003, 0.50677209, 0.52690101, 0.87473387, 0.73918362, 0.39826974, 0.43683919, 0.80459118,
            0.32422684, 0.01958019, 0.95319576, 0.98326137, 0.83931735, 0.69060863, 0.33671416, 0.68062550,
            0.65152380, 0.33392969, 0.03451730, 0.95227244, 0.68200635, 0.85074171, 0.64721009, 0.51234433,
            0.73402047, 0.00969637, 0.93835057, 0.80803854, 0.31485260, 0.20089527, 0.01323282, 0.59933780,
            0.31584602, 0.20209563, 0.33754800, 0.68604181, 0.24443049, 0.19952227, 0.78162632, 0.10336988,
            0.11360736, 0.23536740, 0.23262256, 0.67803776, 0.48749791, 0.74658435, 0.92156640, 0.56706407,
            0.36683221, 0.99157136, 0.23421374, 0.45183767, 0.91609720, 0.85573315, 0.37706276, 0.77042618,
            0.30891908, 0.40709595, 0.06944866, 0.61342849, 0.88817388, 0.58734506, 0.98711323, 0.14744128,
            0.63242656, 0.87704136, 0.68347125, 0.84446569, 0.43265239, 0.25146321, 0.04130111, 0.34259839,
            0.92697368, 0.40878778, 0.56990338, 0.76204273, 0.19820348, 0.66314909, 0.02482844, 0.06669207,
            0.50205581, 0.26084093, 0.65139159, 0.41650223, 0.09733904, 0.56344203, 0.62651696, 0.67332139,
            0.58037374, 0.47258086, 0.21010758, 0.05713135, 0.89390629, 0.10781246, 0.32037450, 0.07628388,
            0.34227964, 0.42190597, 0.58201860, 0.77363549, 0.49595133, 0.86031236, 0.83906769, 0.81098161,
            0.26694195, 0.14215941, 0.88210306, 0.53634237, 0.12090720, 0.82480459, 0.75930318, 0.31847147,
            0.92768077, 0.01037616, 0.56201727, 0.88107122, 0.35925856, 0.85860762, 0.61109408, 0.70408301,
            0.58434977, 0.92192494, 0.62667915, 0.75988365, 0.06858761, 0.36156496, 0.58057195, 0.13636150,
            0.57719713, 0.59340255, 0.63530602, 0.22976282, 0.71915530, 0.41162531, 0.63979565, 0.09931342,
            0.79344045, 0.10893790, 0.84450224, 0.23122236, 0.99485593, 0.73637397, 0.17276368, 0.13357764,
            0.74965804, 0.64991737, 0.61990341, 0.41523170, 0.05878239, 0.05687301, 0.05497131, 0.42868366,
            0.42571090, 0.25810502, 0.89642955, 0.30439758, 0.39310223, 0.11357431, 0.04288255, 0.23397550,
            0.11200634, 0.85621396, 0.89733974, 0.37508865, 0.42077265, 0.68597384, 0.72781399, 0.19296476,
            0.61699087, 0.31667128, 0.67756410, 0.00177323, 0.05725176, 0.79474693, 0.18885238, 0.06724856,
            0.68193156, 0.42202167, 0.22082041, 0.28554673, 0.64995708, 0.87851940, 0.29124547, 0.61009521,
            0.87374537, 0.05743712, 0.69902994, 0.81925115, 0.45653873, 0.37236821, 0.31118709, 0.52734307,
            0.39672836, 0.38185294, 0.30163915, 0.17374510, 0.04913278, 0.90404879, 0.25742801, 0.58266467,
            0.97663209, 0.79823377, 0.36437958, 0.15206043, 0.26529938, 0.22690047, 0.05839021, 0.84721160,
            0.18622435, 0.37809403, 0.55706977, 0.49828704, 0.47659049, 0.24289680, 0.88477595, 0.07807463,
            0.56245739, 0.73490635, 0.21099431, 0.13164942, 0.75840044, 0.66877037, 0.28988183, 0.44046090,
            0.24967434, 0.80048356, 0.26029740, 0.30416821, 0.64151867, 0.52067892, 0.12880774, 0.85465381,
            0.02690525, 0.19149288, 0.49630295, 0.79682619, 0.43566145, 0.00288078, 0.81484193, 0.03763639,
            0.68529083, 0.01339574, 0.38405386, 0.30537067, 0.22994703, 0.44000045, 0.27217985, 0.53831243,
            0.02870435, 0.86282045, 0.61831306, 0.09164956, 0.25609707, 0.07445781, 0.72185784, 0.90058883,
            0.30070608, 0.94476583, 0.56822213, 0.21933909, 0.96772793, 0.80063440, 0.26307906, 0.31183306,
            0.16501252, 0.55436179, 0.68562285, 0.23829083, 0.86511559, 0.57868991, 0.81888344, 0.20126869,
            0.93172350, 0.66028129, 0.21786948, 0.78515828, 0.10262106, 0.35390326, 0.79303876, 0.63427924,
            0.90479631, 0.31024934, 0.60635447, 0.56198079, 0.63573813, 0.91854197, 0.99701497, 0.83085849,
            0.31692291, 0.01925964, 0.97446405, 0.98751283, 0.60944293, 0.13751018, 0.69519957, 0.68956636,
            0.56969015, 0.46440193, 0.88341765, 0.36754434, 0.89223647, 0.39786427, 0.85055280, 0.12749961,
            0.79452122, 0.89449784, 0.14567830, 0.45716830, 0.74822309, 0.28200437, 0.42546044, 0.17464886,
            0.68308746, 0.65496587, 0.52935411, 0.12736159, 0.61523955, 0.81590528, 0.63107864, 0.39786553,
            0.20102294, 0.53292914, 0.75485590, 0.59847044, 0.32861691, 0.12125866, 0.58917183, 0.07638293,
            0.86845380, 0.29192617, 0.03989733, 0.52180460, 0.32503407, 0.64071852, 0.69516575, 0.74254998,
            0.54587026, 0.48713246, 0.32920155, 0.08719954, 0.63497059, 0.54328459, 0.64178757, 0.45583809,
            0.70694291, 0.85212760, 0.86074305, 0.33163422, 0.85739792, 0.59908488, 0.74566046, 0.72157152
        };

        for (int i = 0; i < refInt.length; ++i) {
            int r = mt.nextInt();
            Assert.assertEquals(refInt[i], (r & 0x7fffffffl) | ((r < 0) ? 0x80000000l : 0x0l));
        }

        for (int i = 0; i < refDouble.length; ++i) {
            int r = mt.nextInt();
            Assert.assertEquals(refDouble[i],
                         ((r & 0x7fffffffl) | ((r < 0) ? 0x80000000l : 0x0l)) / 4294967296.0,
                         1.0e-8);
        }

    }

}

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