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Commons Math example source code file (

This example Commons Math source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

erf, erf, mathexception, mathexception

The Commons Math 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
 * 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.math.special;

import org.apache.commons.math.MathException;

 * This is a utility class that provides computation methods related to the
 * error functions.
 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
public class Erf {

     * Default constructor.  Prohibit instantiation.
    private Erf() {

     * Returns the error function erf(x).
     * The implementation of this method is based on:
     * <ul>
     * <li>
     * <a href="">
     * Erf</a>, equation (3).
     * </ul>
     * @param x the value.
     * @return the error function erf(x)
     * @throws MathException if the algorithm fails to converge.
    public static double erf(double x) throws MathException {
        double ret = Gamma.regularizedGammaP(0.5, x * x, 1.0e-15, 10000);
        if (x < 0) {
            ret = -ret;
        return ret;

Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math source code file:

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