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Java > Open Source Codes > org > apache > commons > math > analysis > QuinticFunction


1 /*
2  * Copyright 2003-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.math.analysis;
17
18 import java.io.Serializable JavaDoc;
19
20 import org.apache.commons.math.FunctionEvaluationException;
21
22 /**
23  * Auxillary class for testing solvers.
24  *
25  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
26  */
27 public class QuinticFunction implements DifferentiableUnivariateRealFunction, Serializable JavaDoc {
28
29     static final long serialVersionUID = -8866263034920607152L;
30
31     /* Evaluate quintic.
32      * @see org.apache.commons.math.UnivariateRealFunction#value(double)
33      */
34     public double value(double x) throws FunctionEvaluationException {
35         return (x-1)*(x-0.5)*x*(x+0.5)*(x+1);
36     }
37
38     public UnivariateRealFunction derivative() {
39         return new UnivariateRealFunction() {
40             public double value(double x) throws FunctionEvaluationException {
41                 return (5*x*x-3.75)*x*x+0.25;
42             }
43         };
44     }
45 }
46
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