Example usage for org.apache.commons.math3.random RandomGenerator nextInt

Introduction

In this page you can find the example usage for org.apache.commons.math3.random RandomGenerator nextInt.

Prototype

int nextInt(int n);

Source Link

Document

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Usage

From source file:com.cloudera.oryx.app.traffic.TrafficUtil.java

public static void main(String[] args) throws Exception {
    if (args.length < 3) {
        System.err.println("usage: TrafficUtil [hosts] [requestIntervalMS] [threads] [... other args]");
        return;//from  w ww  . ja v a2  s . c o m
    }

    String[] hostStrings = COMMA.split(args[0]);
    Preconditions.checkArgument(hostStrings.length >= 1);
    int requestIntervalMS = Integer.parseInt(args[1]);
    Preconditions.checkArgument(requestIntervalMS >= 0);
    int numThreads = Integer.parseInt(args[2]);
    Preconditions.checkArgument(numThreads >= 1);

    String[] otherArgs = new String[args.length - 3];
    System.arraycopy(args, 3, otherArgs, 0, otherArgs.length);

    List<URI> hosts = Arrays.stream(hostStrings).map(URI::create).collect(Collectors.toList());

    int perClientRequestIntervalMS = numThreads * requestIntervalMS;

    Endpoints alsEndpoints = new Endpoints(ALSEndpoint.buildALSEndpoints());
    AtomicLong requestCount = new AtomicLong();
    AtomicLong serverErrorCount = new AtomicLong();
    AtomicLong clientErrorCount = new AtomicLong();
    AtomicLong exceptionCount = new AtomicLong();

    long start = System.currentTimeMillis();
    ExecUtils.doInParallel(numThreads, numThreads, true, i -> {
        RandomGenerator random = RandomManager.getRandom(Integer.toString(i).hashCode() ^ System.nanoTime());
        ExponentialDistribution msBetweenRequests;
        if (perClientRequestIntervalMS > 0) {
            msBetweenRequests = new ExponentialDistribution(random, perClientRequestIntervalMS);
        } else {
            msBetweenRequests = null;
        }

        ClientConfig clientConfig = new ClientConfig();
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
        connectionManager.setMaxTotal(numThreads);
        connectionManager.setDefaultMaxPerRoute(numThreads);
        clientConfig.property(ApacheClientProperties.CONNECTION_MANAGER, connectionManager);
        clientConfig.connectorProvider(new ApacheConnectorProvider());
        Client client = ClientBuilder.newClient(clientConfig);

        try {
            while (true) {
                try {
                    WebTarget target = client.target("http://" + hosts.get(random.nextInt(hosts.size())));
                    Endpoint endpoint = alsEndpoints.chooseEndpoint(random);
                    Invocation invocation = endpoint.makeInvocation(target, otherArgs, random);

                    long startTime = System.currentTimeMillis();
                    Response response = invocation.invoke();
                    try {
                        response.readEntity(String.class);
                    } finally {
                        response.close();
                    }
                    long elapsedMS = System.currentTimeMillis() - startTime;

                    int statusCode = response.getStatusInfo().getStatusCode();
                    if (statusCode >= 400) {
                        if (statusCode >= 500) {
                            serverErrorCount.incrementAndGet();
                        } else {
                            clientErrorCount.incrementAndGet();
                        }
                    }

                    endpoint.recordTiming(elapsedMS);

                    if (requestCount.incrementAndGet() % 10000 == 0) {
                        long elapsed = System.currentTimeMillis() - start;
                        log.info("{}ms:\t{} requests\t({} client errors\t{} server errors\t{} exceptions)",
                                elapsed, requestCount.get(), clientErrorCount.get(), serverErrorCount.get(),
                                exceptionCount.get());
                        for (Endpoint e : alsEndpoints.getEndpoints()) {
                            log.info("{}", e);
                        }
                    }

                    if (msBetweenRequests != null) {
                        int desiredElapsedMS = (int) Math.round(msBetweenRequests.sample());
                        if (elapsedMS < desiredElapsedMS) {
                            Thread.sleep(desiredElapsedMS - elapsedMS);
                        }
                    }
                } catch (Exception e) {
                    exceptionCount.incrementAndGet();
                    log.warn("{}", e.getMessage());
                }
            }
        } finally {
            client.close();
        }
    });
}

---

From source file:edu.oregonstate.eecs.mcplan.ml.GaussianMixtureModel.java

/**
 * @param args//w ww  .j a  v a2s . c  o  m
 */
public static void main(final String[] args) {
    final RandomGenerator rng = new MersenneTwister(42);
    final ArrayList<double[]> data = new ArrayList<double[]>();

    // This data displays some problems with singular covariance estimates,
    // perhaps due to "multicollinearity" in the data.
    //      for( int x = -1; x <= 1; ++x ) {
    //         for( int y = -1; y <= 1; ++y ) {
    //            data.add( new double[] { x, y } );
    //            data.add( new double[] { x + 10, y + 10} );
    //            data.add( new double[] { x + 20, y + 20} );
    //            data.add( new double[] { x + 30, y + 30} );
    //         }
    //      }

    final int nsamples = 1000;
    final double[][] mu = new double[][] { new double[] { 0, 0 }, new double[] { 5, 0 }, new double[] { 0, 5 },
            new double[] { 5, 5 } };
    final double[][] Sigma = new double[][] { new double[] { 1, 0 }, new double[] { 0, 1 } };
    final MultivariateNormalDistribution[] p = new MultivariateNormalDistribution[4];
    for (int i = 0; i < 4; ++i) {
        p[i] = new MultivariateNormalDistribution(rng, mu[i], Sigma);
    }
    for (int i = 0; i < nsamples; ++i) {
        final int c = rng.nextInt(4);
        final double[] x = p[c].sample();
        data.add(x);
    }

    // Perturb data
    //      for( final double[] x : data ) {
    //         for( int i = 0; i < x.length; ++i ) {
    //            final double r = rng.nextGaussian() / 1.0;
    //            x[i] += r;
    //         }
    //      }

    double best_bic = Double.MAX_VALUE;
    int best_k = 0;
    for (int k = 1; k <= 6; ++k) {
        System.out.println("*** k = " + k);
        final GaussianMixtureModel gmm = new GaussianMixtureModel(k, data.toArray(new double[data.size()][]),
                10e-5, rng);

        gmm.run();
        for (int i = 0; i < gmm.mu().length; ++i) {
            System.out.println("Center " + i + ": " + gmm.mu()[i]);
        }

        final double bic = ScoreFunctions.bic(data.size(), gmm.nparameters(), gmm.logLikelihood());
        System.out.println("BIC = " + bic);
        System.out.println("ll = " + gmm.logLikelihood());
        gmm.debug();
        if (bic < best_bic) {
            best_bic = bic;
            best_k = k;
        }
    }
    System.out.println("Best model: k = " + best_k);
}

---

From source file:edu.oregonstate.eecs.mcplan.domains.sailing.SailingVisualization.java

public static void main(final String[] argv) {
    final RandomGenerator rng = new MersenneTwister(41);
    final int V = 1;
    final int T = 30;
    final int dim = 10;
    final int scale = 1;
    final double slip = 0.1;
    final double p = 0.2;

    //      final SailingState.Factory state = new SailingWorlds.EmptyRectangleFactory( V, T, 10, 10 );
    ////      final SailingState state = SailingWorlds.squareIsland( T, 15, 5 );
    ////      final SailingState.Factory state = new SailingWorlds.RandomObstaclesFactory( rng, p, T, 10 );
    //      final SailingFsssModel model = new SailingFsssModel( rng, state );
    //      final int viz_scale = 10;
    //      final SailingVisualization vis = new SailingVisualization( model, viz_scale );

    final RandomGenerator world_rng = new MersenneTwister(43);
    final SailingState.Factory state_factory = new SailingWorlds.RandomObstaclesFactory(p, V, T, dim);
    final SailingFsssModel model = new SailingFsssModel(world_rng, state_factory);
    for (int i = 0; i < 2; ++i) {
        SailingState s = model.initialState();
        System.out.println("Initial state:");
        System.out.println(s);/*from  ww  w  .  j  av a2s. c o m*/
        final SailingFsssModel sim_model = (SailingFsssModel) model.create(rng);
        while (!s.isTerminal()) {
            final SailingAction a = new SailingAction(rng.nextInt(SailingState.Nwind_directions));
            s = sim_model.sampleTransition(s, a);
            System.out.println(s);
        }
    }

}

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From source file:fingerprints.helper.RandomNumber.java

/**
 * Mersenne Twister Random Number//  w  w w. ja  v  a 2s  .  co  m
 *
 * @param maximum
 * @return
 */
public static long generateMersenneTwisterRandomNumber(int maximum) {
    RandomGenerator rg = new RandomAdaptor(new MersenneTwister());
    return rg.nextInt(maximum);
}

---

From source file:fingerprints.helper.RandomNumber.java

/**
 * Mersenne Twister Random Number for a hashcode within a range between 0 to maximum
 *
 * @param maximum//w  ww . j av a  2  s .c  om
 * @param hashCode
 * @return
 */
public static long generateMersenneTwisterRandomNumber(int maximum, long hashCode) {
    RandomGenerator rg = new RandomAdaptor(new MersenneTwister(hashCode));
    return rg.nextInt(maximum);
}

---

From source file:com.milaboratory.core.mutations.generator.UniformMutationsGenerator.java

public static final <S extends Sequence<S>> int createUniformMutation(S sequence, RandomGenerator generator) {
    return createUniformMutation(sequence, generator, types[generator.nextInt(3)]);
}

---

From source file:edu.oregonstate.eecs.mcplan.util.ListUtil.java

public static <T> void randomShuffle(final RandomGenerator rng, final T[] v) {
    for (int i = v.length - 1; i >= 0; --i) {
        final int idx = rng.nextInt(i + 1);
        final T t = v[idx];
        v[idx] = v[i];//from w  ww.  j  a v a 2  s  .  c  om
        v[i] = t;
    }
}

---

From source file:edu.oregonstate.eecs.mcplan.util.ListUtil.java

public static void randomShuffle(final RandomGenerator rng, final int[] v) {
    for (int i = v.length - 1; i >= 0; --i) {
        final int idx = rng.nextInt(i + 1);
        final int t = v[idx];
        v[idx] = v[i];//from   w  w  w .ja v  a  2s  .c  o  m
        v[i] = t;
    }
}

---

From source file:edu.oregonstate.eecs.mcplan.util.ListUtil.java

public static <T> void randomShuffle(final RandomGenerator rng, final List<T> v) {
    for (int i = v.size() - 1; i >= 0; --i) {
        final int idx = rng.nextInt(i + 1);
        final T t = v.get(idx);
        v.set(idx, v.get(i));//from  w  w  w. j  ava 2s.  c  o m
        v.set(i, t);
    }
}

---

From source file:com.github.rinde.rinsim.scenario.ScenarioTestUtil.java

public static Scenario create(long seed) {
    final int endTime = 3 * 60 * 60 * 1000;
    Scenario.Builder b = Scenario.builder()
            .addModel(PlaneRoadModel.supplier(new Point(0, 0), new Point(10, 10), SI.KILOMETER,
                    Measure.valueOf(50d, NonSI.KILOMETERS_PER_HOUR)))
            .addModel(DefaultPDPModel.supplier(TimeWindowPolicies.LIBERAL)).addEvents(Collections.nCopies(10,
                    new AddVehicleEvent(-1, VehicleDTO.builder().startPosition(new Point(5, 5)).build())));

    RandomGenerator rng = new MersenneTwister(seed);
    for (int i = 0; i < 20; i++) {
        long announceTime = rng.nextInt(DoubleMath.roundToInt(endTime * .8, RoundingMode.FLOOR));
        b.addEvent(new AddParcelEvent(ParcelDTO
                .builder(new Point(rng.nextDouble() * 10, rng.nextDouble() * 10),
                        new Point(rng.nextDouble() * 10, rng.nextDouble() * 10))
                .orderAnnounceTime(announceTime).pickupTimeWindow(new TimeWindow(announceTime, endTime))
                .deliveryTimeWindow(new TimeWindow(announceTime, endTime)).neededCapacity(0).build()));
    }/*from  w  w w. ja  v a 2 s  .  c  o  m*/

    b.addEvent(new TimedEvent(PDPScenarioEvent.TIME_OUT, endTime)).scenarioLength(endTime)
            .stopCondition(new EndTimeStopCondition(endTime));

    b.addEventType(PDPScenarioEvent.ADD_DEPOT);

    return b.build();
}

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