1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.math.analysis;
18
19 import java.io.Serializable;
20
21 import org.apache.commons.math.FunctionEvaluationException;
22
23 /**
24 * Auxillary class for testing solvers.
25 *
26 * @version $Revision: 480442 $ $Date: 2006-11-29 00:21:22 -0700 (Wed, 29 Nov 2006) $
27 */
28 public class QuinticFunction implements DifferentiableUnivariateRealFunction, Serializable {
29
30 private static final long serialVersionUID = -8866263034920607152L;
31
32 /* Evaluate quintic.
33 * @see org.apache.commons.math.UnivariateRealFunction#value(double)
34 */
35 public double value(double x) throws FunctionEvaluationException {
36 return (x-1)*(x-0.5)*x*(x+0.5)*(x+1);
37 }
38
39 public UnivariateRealFunction derivative() {
40 return new UnivariateRealFunction() {
41 public double value(double x) throws FunctionEvaluationException {
42 return (5*x*x-3.75)*x*x+0.25;
43 }
44 };
45 }
46 }