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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  
23  package org.hipparchus.analysis.function;
24  
25  import org.hipparchus.analysis.differentiation.Derivative;
26  import org.hipparchus.analysis.differentiation.UnivariateDifferentiableFunction;
27  import org.hipparchus.util.FastMath;
28  
29  /**
30   * Power function.
31   *
32   */
33  public class Power implements UnivariateDifferentiableFunction {
34      /** Power. */
35      private final double p;
36  
37      /** Simple constructor.
38       * @param p Power.
39       */
40      public Power(double p) {
41          this.p = p;
42      }
43  
44      /** {@inheritDoc} */
45      @Override
46      public double value(double x) {
47          return FastMath.pow(x, p);
48      }
49  
50      /** {@inheritDoc}
51       */
52      @Override
53      public <T extends Derivative<T>> T value(T t) {
54          return t.pow(p);
55      }
56  
57  }