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.math4.legacy.analysis;
18
19 import org.apache.commons.math4.legacy.analysis.differentiation.DerivativeStructure;
20 import org.apache.commons.math4.legacy.analysis.differentiation.UnivariateDifferentiableFunction;
21
22 /**
23 * Auxiliary class for testing solvers.
24 *
25 */
26 public class QuinticFunction implements UnivariateDifferentiableFunction {
27
28 /* Evaluate quintic.
29 * @see org.apache.commons.math4.legacy.UnivariateFunction#value(double)
30 */
31 @Override
32 public double value(double x) {
33 return (x-1)*(x-0.5)*x*(x+0.5)*(x+1);
34 }
35
36 @Override
37 public DerivativeStructure value(DerivativeStructure t) {
38 return t.subtract(1).multiply(t.subtract(0.5)).multiply(t).multiply(t.add(0.5)).multiply(t.add(1));
39 }
40 }