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High performance scientific and technical computing data structures and methods, mostly based on CERN's Colt Java API

There is a newer version: 0.13.0

/*
 * 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.mahout.math.random;

import org.apache.mahout.common.RandomUtils;

import java.util.Random;

public final class Normal extends AbstractSamplerFunction {
  private final Random rand = RandomUtils.getRandom();
  private double mean = 0;
  private double sd = 1;

  public Normal() {}

  public Normal(double mean, double sd) {
    this.mean = mean;
    this.sd = sd;
  }

  @Override
  public Double sample() {
    return rand.nextGaussian() * sd + mean;
  }
}