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Java example source code file (ArrayRealVectorTest.java)

This example Java source code file (ArrayRealVectorTest.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.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arrayrealvector, arrayrealvectortest, double, mathillegalargumentexception, override, realvectorabstracttest, realvectortestimpl, test

The ArrayRealVectorTest.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.linear;

import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.junit.Assert;
import org.junit.Test;

/**
 * Test cases for the {@link ArrayRealVector} class.
 *
 */
public class ArrayRealVectorTest extends RealVectorAbstractTest {


    @Override
    public RealVector create(final double[] data) {
        return new ArrayRealVector(data, true);
    }

    @Test
    public void testConstructors() {
        final double[] vec1 = {1d, 2d, 3d};
        final double[] vec3 = {7d, 8d, 9d};
        final double[] vec4 = {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d, 9d};
        final Double[] dvec1 = {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d, 9d};

        ArrayRealVector v0 = new ArrayRealVector();
        Assert.assertEquals("testData len", 0, v0.getDimension());

        ArrayRealVector v1 = new ArrayRealVector(7);
        Assert.assertEquals("testData len", 7, v1.getDimension());
        Assert.assertEquals("testData is 0.0 ", 0.0, v1.getEntry(6), 0);

        ArrayRealVector v2 = new ArrayRealVector(5, 1.23);
        Assert.assertEquals("testData len", 5, v2.getDimension());
        Assert.assertEquals("testData is 1.23 ", 1.23, v2.getEntry(4), 0);

        ArrayRealVector v3 = new ArrayRealVector(vec1);
        Assert.assertEquals("testData len", 3, v3.getDimension());
        Assert.assertEquals("testData is 2.0 ", 2.0, v3.getEntry(1), 0);

        ArrayRealVector v3_bis = new ArrayRealVector(vec1, true);
        Assert.assertEquals("testData len", 3, v3_bis.getDimension());
        Assert.assertEquals("testData is 2.0 ", 2.0, v3_bis.getEntry(1), 0);
        Assert.assertNotSame(v3_bis.getDataRef(), vec1);
        Assert.assertNotSame(v3_bis.toArray(), vec1);

        ArrayRealVector v3_ter = new ArrayRealVector(vec1, false);
        Assert.assertEquals("testData len", 3, v3_ter.getDimension());
        Assert.assertEquals("testData is 2.0 ", 2.0, v3_ter.getEntry(1), 0);
        Assert.assertSame(v3_ter.getDataRef(), vec1);
        Assert.assertNotSame(v3_ter.toArray(), vec1);

        ArrayRealVector v4 = new ArrayRealVector(vec4, 3, 2);
        Assert.assertEquals("testData len", 2, v4.getDimension());
        Assert.assertEquals("testData is 4.0 ", 4.0, v4.getEntry(0), 0);
        try {
            new ArrayRealVector(vec4, 8, 3);
            Assert.fail("MathIllegalArgumentException expected");
        } catch (MathIllegalArgumentException ex) {
            // expected behavior
        }

        RealVector v5_i = new ArrayRealVector(dvec1);
        Assert.assertEquals("testData len", 9, v5_i.getDimension());
        Assert.assertEquals("testData is 9.0 ", 9.0, v5_i.getEntry(8), 0);

        ArrayRealVector v5 = new ArrayRealVector(dvec1);
        Assert.assertEquals("testData len", 9, v5.getDimension());
        Assert.assertEquals("testData is 9.0 ", 9.0, v5.getEntry(8), 0);

        ArrayRealVector v6 = new ArrayRealVector(dvec1, 3, 2);
        Assert.assertEquals("testData len", 2, v6.getDimension());
        Assert.assertEquals("testData is 4.0 ", 4.0, v6.getEntry(0), 0);
        try {
            new ArrayRealVector(dvec1, 8, 3);
            Assert.fail("MathIllegalArgumentException expected");
        } catch (MathIllegalArgumentException ex) {
            // expected behavior
        }

        ArrayRealVector v7 = new ArrayRealVector(v1);
        Assert.assertEquals("testData len", 7, v7.getDimension());
        Assert.assertEquals("testData is 0.0 ", 0.0, v7.getEntry(6), 0);

        RealVectorTestImpl v7_i = new RealVectorTestImpl(vec1);

        ArrayRealVector v7_2 = new ArrayRealVector(v7_i);
        Assert.assertEquals("testData len", 3, v7_2.getDimension());
        Assert.assertEquals("testData is 0.0 ", 2.0d, v7_2.getEntry(1), 0);

        ArrayRealVector v8 = new ArrayRealVector(v1, true);
        Assert.assertEquals("testData len", 7, v8.getDimension());
        Assert.assertEquals("testData is 0.0 ", 0.0, v8.getEntry(6), 0);
        Assert.assertNotSame("testData not same object ", v1.getDataRef(), v8.getDataRef());

        ArrayRealVector v8_2 = new ArrayRealVector(v1, false);
        Assert.assertEquals("testData len", 7, v8_2.getDimension());
        Assert.assertEquals("testData is 0.0 ", 0.0, v8_2.getEntry(6), 0);
        Assert.assertEquals("testData same object ", v1.getDataRef(), v8_2.getDataRef());

        ArrayRealVector v9 = new ArrayRealVector(v1, v3);
        Assert.assertEquals("testData len", 10, v9.getDimension());
        Assert.assertEquals("testData is 1.0 ", 1.0, v9.getEntry(7), 0);

        ArrayRealVector v10 = new ArrayRealVector(v2, new RealVectorTestImpl(vec3));
        Assert.assertEquals("testData len", 8, v10.getDimension());
        Assert.assertEquals("testData is 1.23 ", 1.23, v10.getEntry(4), 0);
        Assert.assertEquals("testData is 7.0 ", 7.0, v10.getEntry(5), 0);

        ArrayRealVector v11 = new ArrayRealVector(new RealVectorTestImpl(vec3), v2);
        Assert.assertEquals("testData len", 8, v11.getDimension());
        Assert.assertEquals("testData is 9.0 ", 9.0, v11.getEntry(2), 0);
        Assert.assertEquals("testData is 1.23 ", 1.23, v11.getEntry(3), 0);

        ArrayRealVector v12 = new ArrayRealVector(v2, vec3);
        Assert.assertEquals("testData len", 8, v12.getDimension());
        Assert.assertEquals("testData is 1.23 ", 1.23, v12.getEntry(4), 0);
        Assert.assertEquals("testData is 7.0 ", 7.0, v12.getEntry(5), 0);

        ArrayRealVector v13 = new ArrayRealVector(vec3, v2);
        Assert.assertEquals("testData len", 8, v13.getDimension());
        Assert.assertEquals("testData is 9.0 ", 9.0, v13.getEntry(2), 0);
        Assert.assertEquals("testData is 1.23 ", 1.23, v13.getEntry(3), 0);

        ArrayRealVector v14 = new ArrayRealVector(vec3, vec4);
        Assert.assertEquals("testData len", 12, v14.getDimension());
        Assert.assertEquals("testData is 9.0 ", 9.0, v14.getEntry(2), 0);
        Assert.assertEquals("testData is 1.0 ", 1.0, v14.getEntry(3), 0);

    }

    @Test
    public void testGetDataRef() {
        final double[] data = {1d, 2d, 3d, 4d};
        final ArrayRealVector v = new ArrayRealVector(data);
        v.getDataRef()[0] = 0d;
        Assert.assertEquals("", 0d, v.getEntry(0), 0);
    }

    @Test
    public void testPredicates() {

        Assert.assertEquals(create(new double[] { Double.NaN, 1, 2 }).hashCode(),
                     create(new double[] { 0, Double.NaN, 2 }).hashCode());

        Assert.assertTrue(create(new double[] { Double.NaN, 1, 2 }).hashCode() !=
                   create(new double[] { 0, 1, 2 }).hashCode());
    }

    @Test
    public void testZeroVectors() {
        Assert.assertEquals(0, new ArrayRealVector(new double[0]).getDimension());
        Assert.assertEquals(0, new ArrayRealVector(new double[0], true).getDimension());
        Assert.assertEquals(0, new ArrayRealVector(new double[0], false).getDimension());
    }
}

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