MathUtility.java

/*
 * chombo: Hadoop Map Reduce utility
 * Author: Pranab Ghosh
 * 
 * Licensed 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.chombo.util;

public class MathUtility {

	/**
	 * Samples gaussian distribution
	 * @param mean
	 * @param stdDev
	 * @return
	 */
	public static double sampleGaussian(double mean, double stdDev) {
		double value = 0;
		for (int i = 0; i < 12; ++i) {
			value += Math.random();
		}
		value -= 6.0;
		value = mean + value * stdDev; 
		return value;
	}

}