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.clustering.distance;
23
24 import org.hipparchus.exception.MathIllegalArgumentException;
25 import org.hipparchus.util.MathArrays;
26
27 /**
28 * Calculates the L<sub>2</sub> (Euclidean) distance between two points.
29 *
30 */
31 public class EuclideanDistance implements DistanceMeasure {
32
33 /** Serializable version identifier. */
34 private static final long serialVersionUID = 1717556319784040040L;
35
36 /** Empty constructor.
37 * <p>
38 * This constructor is not strictly necessary, but it prevents spurious
39 * javadoc warnings with JDK 18 and later.
40 * </p>
41 * @since 3.0
42 */
43 public EuclideanDistance() { // NOPMD - unnecessary constructor added intentionally to make javadoc happy
44 // nothing to do
45 }
46
47 /** {@inheritDoc} */
48 @Override
49 public double compute(double[] a, double[] b)
50 throws MathIllegalArgumentException {
51 return MathArrays.distance(a, b);
52 }
53
54 }