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
18 package org.apache.commons.math4.legacy.analysis.function;
19
20 import org.apache.commons.math4.legacy.analysis.differentiation.DerivativeStructure;
21 import org.apache.commons.math4.legacy.analysis.differentiation.UnivariateDifferentiableFunction;
22 import org.apache.commons.math4.core.jdkmath.JdkMath;
23
24 /**
25 * Power function.
26 *
27 * @since 3.0
28 */
29 public class Power implements UnivariateDifferentiableFunction {
30 /** Power. */
31 private final double p;
32
33 /**
34 * @param p Power.
35 */
36 public Power(double p) {
37 this.p = p;
38 }
39
40 /** {@inheritDoc} */
41 @Override
42 public double value(double x) {
43 return JdkMath.pow(x, p);
44 }
45
46 /** {@inheritDoc}
47 * @since 3.1
48 */
49 @Override
50 public DerivativeStructure value(final DerivativeStructure t) {
51 return t.pow(p);
52 }
53 }