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Java example source code file (EuclideanDoublePointTest.java)

This example Java source code file (EuclideanDoublePointTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

arraylist, deprecated, euclideandoublepoint, euclideandoublepointtest, test, util

The EuclideanDoublePointTest.java Java example source code

/*
 * 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.math3.stat.clustering;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.math3.TestUtils;
import org.apache.commons.math3.util.FastMath;
import org.junit.Assert;
import org.junit.Test;

@Deprecated
public class EuclideanDoublePointTest {

    @Test
    public void testArrayIsReference() {
        final double[] array = { -3.0, -2.0, -1.0, 0.0, 1.0 };
        Assert.assertArrayEquals(array, new EuclideanDoublePoint(array).getPoint(), 1.0e-15);
    }

    @Test
    public void testDistance() {
        final EuclideanDoublePoint e1 = new EuclideanDoublePoint(new double[] { -3.0, -2.0, -1.0, 0.0, 1.0 });
        final EuclideanDoublePoint e2 = new EuclideanDoublePoint(new double[] { 1.0, 0.0, -1.0, 1.0, 1.0 });
        Assert.assertEquals(FastMath.sqrt(21.0), e1.distanceFrom(e2), 1.0e-15);
        Assert.assertEquals(0.0, e1.distanceFrom(e1), 1.0e-15);
        Assert.assertEquals(0.0, e2.distanceFrom(e2), 1.0e-15);
    }

    @Test
    public void testCentroid() {
        final List<EuclideanDoublePoint> list = new ArrayList();
        list.add(new EuclideanDoublePoint(new double[] { 1.0, 3.0 }));
        list.add(new EuclideanDoublePoint(new double[] { 2.0, 2.0 }));
        list.add(new EuclideanDoublePoint(new double[] { 3.0, 3.0 }));
        list.add(new EuclideanDoublePoint(new double[] { 2.0, 4.0 }));
        final EuclideanDoublePoint c = list.get(0).centroidOf(list);
        Assert.assertEquals(2.0, c.getPoint()[0], 1.0e-15);
        Assert.assertEquals(3.0, c.getPoint()[1], 1.0e-15);
    }

    @Test
    public void testSerial() {
        final EuclideanDoublePoint p = new EuclideanDoublePoint(new double[] { -3.0, -2.0, -1.0, 0.0, 1.0 });
        Assert.assertEquals(p, TestUtils.serializeAndRecover(p));
    }

}

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