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
28 /**
29 * Constant function.
30 *
31 */
32 public class Constant implements UnivariateDifferentiableFunction {
33 /** Constant. */
34 private final double c;
35
36 /** Simple constructor.
37 * @param c Constant.
38 */
39 public Constant(double c) {
40 this.c = c;
41 }
42
43 /** {@inheritDoc} */
44 @Override
45 public double value(double x) {
46 return c;
47 }
48
49 /** {@inheritDoc}
50 */
51 @Override
52 public <T extends Derivative<T>> T value(T t) {
53 return t.getField().getZero().add(c);
54 }
55
56 }