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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    *      https://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  
18  /*
19   * This is not the original file distributed by the Apache Software Foundation
20   * It has been modified by the Hipparchus project
21   */
22  package org.hipparchus.analysis;
23  
24  import org.hipparchus.analysis.differentiation.Derivative;
25  import org.hipparchus.analysis.differentiation.UnivariateDifferentiableFunction;
26  
27  /**
28   * Auxiliary class for testing solvers.
29   *
30   */
31  public class QuinticFunction implements UnivariateDifferentiableFunction {
32  
33      /* Evaluate quintic.
34       * @see org.hipparchus.UnivariateFunction#value(double)
35       */
36      @Override
37      public double value(double x) {
38          return (x-1)*(x-0.5)*x*(x+0.5)*(x+1);
39      }
40  
41      @Override
42      public <T extends Derivative<T>> T value(T t) {
43          return t.subtract(1).multiply(t.subtract(0.5)).multiply(t).multiply(t.add(0.5)).multiply(t.add(1));
44      }
45  
46  }