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# Java > Open Source Codes > org > apache > commons > math > analysis > derivative > CenterDifferenceDerivative

 `1 /*2  * 3  * Copyright (c) 2003-2004 The Apache Software Foundation. All rights reserved.4  * 5  * Licensed under the Apache License, Version 2.0 (the "License"); you may not6  * use this file except in compliance with the License. You may obtain a copy7  * of the License at8  * 9  * http://www.apache.org/licenses/LICENSE-2.010  * 11  * Unless required by applicable law or agreed to in writing, software12  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT13  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the14  * License for the specific language governing permissions and limitations15  * under the License.16  * 17  */18 19 package org.apache.commons.math.analysis.derivative;20 21 import org.apache.commons.math.MathException;22 import org.apache.commons.math.analysis.UnivariateRealFunction;23 24 /**25  * @todo add javadoc comment26  * @version \$Revision\$ \$Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) \$27  */28 public class CenterDifferenceDerivative extends AbstractDifferenceDerivative {29     30     /**31      * @todo add javadoc comment32      */33     public CenterDifferenceDerivative(UnivariateRealFunction function, double h) {34         super(function, h);35     }36     37     /**38      * @todo add javadoc comment39      */40     public double value(double x) throws MathException {41         UnivariateRealFunction f = getFunction();42         double h2 = getDelta();43         double h = h2 * .5;44         return (f.value(x + h) - f.value(x - h)) / h2;45     } 46     47     /**48      * 49      */50     public static UnivariateRealFunction decorate(UnivariateRealFunction function, double h) {51         return new CenterDifferenceDerivative(function, h);52     }53 }54 ` Popular Tags