| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.math4.legacy.ml.distance; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.apache.commons.math4.legacy.core.jdkmath.AccurateMath; |
| |
| /** |
| * Tests for {@link EuclideanDistance} class. |
| */ |
| public class EuclideanDistanceTest { |
| private final DistanceMeasure distance = new EuclideanDistance(); |
| |
| @Test |
| public void testZero() { |
| final double[] a = { 0, 1, -2, 3.4, 5, -6.7, 89 }; |
| Assert.assertEquals(0, distance.compute(a, a), 0d); |
| } |
| |
| @Test |
| public void test() { |
| final double[] a = { 1, -2, 3, 4 }; |
| final double[] b = { -5, -6, 7, 8 }; |
| final double expected = AccurateMath.sqrt(84); |
| Assert.assertEquals(expected, distance.compute(a, b), 0d); |
| Assert.assertEquals(expected, distance.compute(b, a), 0d); |
| } |
| } |