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Java example source code file (UniformRandomGenerator.java)

This example Java source code file (UniformRandomGenerator.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

normalizedrandomgenerator, randomgenerator, sqrt3, uniformrandomgenerator

The UniformRandomGenerator.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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.commons.math3.random;

import org.apache.commons.math3.util.FastMath;

 * This class implements a normalized uniform random generator.
 * <p>Since it is a normalized random generator, it generates values
 * from a uniform distribution with mean equal to 0 and standard
 * deviation equal to 1. Generated values fall in the range
 * [-√3, +√3].</p>
 * @since 1.2

public class UniformRandomGenerator implements NormalizedRandomGenerator {

    /** Square root of three. */
    private static final double SQRT3 = FastMath.sqrt(3.0);

    /** Underlying generator. */
    private final RandomGenerator generator;

    /** Create a new generator.
     * @param generator underlying random generator to use
    public UniformRandomGenerator(RandomGenerator generator) {
        this.generator = generator;

    /** Generate a random scalar with null mean and unit standard deviation.
     * <p>The number generated is uniformly distributed between -&sqrt;(3)
     * and +&sqrt;(3).</p>
     * @return a random scalar with null mean and unit standard deviation
    public double nextNormalizedDouble() {
        return SQRT3 * (2 * generator.nextDouble() - 1.0);


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