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;
19
20 import org.apache.commons.math.FunctionEvaluationException;
21
22 /***
23 * Auxillary class for testing solvers.
24 *
25 * @version $Revision: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $
26 */
27 public class QuinticFunction implements DifferentiableUnivariateRealFunction, Serializable {
28
29 private 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 }