Example usage for java.util.stream DoubleStream generate

Introduction

In this page you can find the example usage for java.util.stream DoubleStream generate.

Prototype

public static DoubleStream generate(DoubleSupplier s) 

Source Link

Document

Returns an infinite sequential unordered stream where each element is generated by the provided DoubleSupplier .

Usage

From source file:Main.java

public static void main(String[] args) {
    DoubleStream i = DoubleStream.generate(new Random()::nextDouble);
    Stream<Double> o = i.boxed();

    o.limit(10).forEach(System.out::println);
}

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From source file:com.wormsim.tracking.ChangingDoubleInstance.java

/**
 * Returns the mean of the squares of the most recently collected data that
 * has not yet formed a checkpoint./*from   w  w  w .j  ava  2s.c  o m*/
 *
 * @return The recent mean
 */
@Override
public final double getRecentSquareMean() {
    final TDoubleIterator iter = history.iterator();
    final double[] total = new double[] { 0.0 };
    DoubleStream.generate(() -> iter.next()).peek((d) -> {
        total[0] += FastMath.pow(d, 2);
    }).anyMatch((d) -> !iter.hasNext());
    return total[0] / (history.size());
}

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From source file:com.wormsim.tracking.ChangingDoubleInstance.java

/**
 * Returns the variance of the most recently collected data that has not yet
 * formed a checkpoint.// w w w  . j a v  a 2s  .  c om
 *
 * @return The recent variance
 */
@Override
public final double getRecentVariance() {
    final double psi_m = history.sum() / history.size();
    final TDoubleIterator iter = history.iterator();
    final double[] total = new double[] { 0.0 };
    DoubleStream.generate(() -> iter.next()).peek((d) -> {
        total[0] += FastMath.pow(d - psi_m, 2);
    }).anyMatch((d) -> !iter.hasNext());
    return total[0] / (history.size() - 1);
}

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