Example usage for java.util Random nextDouble

Introduction

In this page you can find the example usage for java.util Random nextDouble.

Prototype

public double nextDouble()

Source Link

Document

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Usage

From source file:enumj.EnumerableGenerator.java

public Double[] elems() {
    final Double[] ret = new Double[SIZE];
    final Random rnd = new Random(this.rnd.nextLong());
    for (int i = 0; i < SIZE; ++i) {
        ret[i] = rnd.nextDouble();
    }/* w  ww . j a  va2 s .c om*/
    return ret;
}

From source file:org.diorite.commons.math.DioriteRandomUtils.java

public static double getRandomDouble(Random random, double min, double max) throws IllegalArgumentException {
    if (Double.compare(min, max) == 0) {
        return max;
    }/* ww  w . j  a v  a2  s  . c  om*/
    Validate.isTrue(max > min, "Max can't be smaller than min!");
    return (random.nextDouble() * (max - min)) + min;
}

From source file:eu.amidst.core.exponentialfamily.EF_Gamma.java

/**
 * {@inheritDoc}/*from   w w  w.ja va 2s.co m*/
 */
@Override
public EF_UnivariateDistribution randomInitialization(Random random) {

    double randomVar = random.nextDouble() * 2 + 1 + 0.01;

    double alpha = 10;
    double beta = randomVar * alpha;

    this.getNaturalParameters().set(0, alpha - 1);
    this.getNaturalParameters().set(1, -beta);

    this.fixNumericalInstability();
    this.updateMomentFromNaturalParameters();

    return this;
}

From source file:com.c123.billbuddy.client.PaymentFeeder.java

@Transactional
public void createPayment() {

    Random random = new Random();

    int userId = (int) (userCount * random.nextDouble());
    user = gigaSpace.readById(User.class, new Integer(userId));

    int merchantId = (int) (merchantCount * random.nextDouble());
    merchant = gigaSpace.readById(Merchant.class, new Integer(merchantId));

    if (user != null && merchant != null) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        Date date = calendar.getTime();

        Double paymentAmount = Double.valueOf(Math.random() * 100);
        paymentAmount = Math.round(paymentAmount * 100.0) / 100.0;

        // Check If user valid and have credit limit
        if (user.getStatus() != AccountStatus.ACTIVE) {
            log.info("User: " + user.getName() + " status is " + user.getStatus());
        } else if (user.getBalance() - paymentAmount < user.getCreditLimit()) {
            log.info("User: " + user.getName() + " doesn't have credit.");

            Double addUserBalance = Double.valueOf(Math.random() * 1000);
            addUserBalance = Math.round(addUserBalance * 100.0) / 100.0;

            log.info("Add " + addUserBalance + " to user balance");

            user.setBalance(user.getBalance() + addUserBalance);
            gigaSpace.write(user);/*from   w ww.j a  v  a2 s  .  c om*/

        } else {

            // Withdraw payment amount from user account
            updateUserBalance(user, paymentAmount);

            // Deposit payment amount to merchant account                    
            updateMerchantReceipts(merchant, paymentAmount);

            // Create a Payment POJO and set it up.  
            Payment payment = new Payment();

            payment.setPayingAccountId(user.getUserAccountId());
            payment.setReceivingMerchantId(merchant.getMerchantAccountId());
            payment.setDescription(merchant.getCategory().name());
            payment.setCreatedDate(date);
            payment.setPaymentAmount(Double.valueOf(Math.random() * 100));
            payment.setPaymentAmount(Math.round(paymentAmount * 100.0) / 100.0);
            payment.setStatus(TransactionStatus.NEW);

            // Write the payment object
            gigaSpace.write(payment);

            log.info("TransactionWriterTask wrote new transaction between user: " + user.getName()
                    + " and merchant: " + merchant.getName());
        }
    }
}

From source file:org.jenetics.stat.DoubleMomentStatisticsTest.java

private List<Double> numbers(final int size) {
    final Random random = new Random(123);
    final List<Double> numbers = new ArrayList<>(size);
    for (int i = 0; i < size; ++i) {
        numbers.add(random.nextDouble());
    }/*from   ww  w.j a  v  a 2 s.  c  o m*/

    return numbers;
}

From source file:org.apache.edgent.samples.utils.sensor.PeriodicRandomSensor.java

/**
 * Create a periodic sensor stream with readings from {@link Random#nextDouble()}.
 * @param t the topology to add the sensor stream to
 * @param periodMsec how frequently to generate a reading
 * @return the sensor value stream/*from   w  w  w.  j  a va  2  s.com*/
 */
public TStream<Pair<Long, Double>> newDouble(Topology t, long periodMsec) {
    Random r = newRandom();
    return t.poll(() -> new Pair<Long, Double>(System.currentTimeMillis(), r.nextDouble()), periodMsec,
            TimeUnit.MILLISECONDS);

}

From source file:org.jenetics.stat.LongMomentStatisticsTest.java

private List<Long> numbers(final int size) {
    final Random random = new Random(123);
    final List<Long> numbers = new ArrayList<>(size);
    for (int i = 0; i < size; ++i) {
        numbers.add((long) (random.nextDouble() * 10_000));
    }/* www .j  a  v  a  2s. c  om*/

    return numbers;
}

From source file:com.comphenix.xp.SampleRange.java

public double sampleDouble(Random rnd) {
    if (start == end)
        return start;
    else//from  w  w  w .  j a  v  a  2s. c  om
        return start + (end - start) * rnd.nextDouble();
}

From source file:fi.vm.sade.organisaatio.service.oid.OrganisaatioOIDServiceImpl.java

private String generateRandom() {

    long min = 1000000000L;
    long max = 10000000000L;

    Random r = new Random();
    long number = min + ((long) (r.nextDouble() * (max - min)));

    String n = Long.toString(number);
    n += luhnChecksum(number);//w  w  w . j  a v  a  2 s . com
    return n;
}

From source file:org.jenetics.stat.IntMomentStatisticsTest.java

private List<Integer> numbers(final int size) {
    final Random random = new Random(123);
    final List<Integer> numbers = new ArrayList<>(size);
    for (int i = 0; i < size; ++i) {
        numbers.add((int) (random.nextDouble() * 10_000));
    }//  w  w  w  .ja  v  a2  s.c  om

    return numbers;
}