home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (MathArraysTest.java)

This example Java source code file (MathArraysTest.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

dimensionmismatchexception, double, expecting, matharithmeticexception, mathillegalargumentexception, nodataexception, nonmonotonicsequenceexception, notanumberexception, notpositiveexception, notstrictlypositiveexception, nullargumentexception, nullpointerexception, test, util, well1024a

The MathArraysTest.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.util;

import java.util.Arrays;

import org.apache.commons.math3.TestUtils;
import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MathArithmeticException;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.exception.NoDataException;
import org.apache.commons.math3.exception.NonMonotonicSequenceException;
import org.apache.commons.math3.exception.NotPositiveException;
import org.apache.commons.math3.exception.NotStrictlyPositiveException;
import org.apache.commons.math3.exception.NullArgumentException;
import org.apache.commons.math3.exception.NotANumberException;
import org.apache.commons.math3.random.Well1024a;
import org.junit.Assert;
import org.junit.Test;

/**
 * Test cases for the {@link MathArrays} class.
 *
 */
public class MathArraysTest {

    private double[] testArray = {0, 1, 2, 3, 4, 5};
    private double[] testWeightsArray = {0.3, 0.2, 1.3, 1.1, 1.0, 1.8};
    private double[] testNegativeWeightsArray = {-0.3, 0.2, -1.3, 1.1, 1.0, 1.8};
    private double[] nullArray = null;
    private double[] singletonArray = {0};

    @Test
    public void testScale() {
        final double[] test = new double[] { -2.5, -1, 0, 1, 2.5 };
        final double[] correctTest = MathArrays.copyOf(test);
        final double[] correctScaled = new double[]{5.25, 2.1, 0, -2.1, -5.25};

        final double[] scaled = MathArrays.scale(-2.1, test);

        // Make sure test has not changed
        for (int i = 0; i < test.length; i++) {
            Assert.assertEquals(correctTest[i], test[i], 0);
        }

        // Test scaled values
        for (int i = 0; i < scaled.length; i++) {
            Assert.assertEquals(correctScaled[i], scaled[i], 0);
        }
    }

    @Test
    public void testScaleInPlace() {
        final double[] test = new double[] { -2.5, -1, 0, 1, 2.5 };
        final double[] correctScaled = new double[]{5.25, 2.1, 0, -2.1, -5.25};
        MathArrays.scaleInPlace(-2.1, test);

        // Make sure test has changed
        for (int i = 0; i < test.length; i++) {
            Assert.assertEquals(correctScaled[i], test[i], 0);
        }
    }

    @Test(expected=DimensionMismatchException.class)
    public void testEbeAddPrecondition() {
        MathArrays.ebeAdd(new double[3], new double[4]);
    }
    @Test(expected=DimensionMismatchException.class)
    public void testEbeSubtractPrecondition() {
        MathArrays.ebeSubtract(new double[3], new double[4]);
    }
    @Test(expected=DimensionMismatchException.class)
    public void testEbeMultiplyPrecondition() {
        MathArrays.ebeMultiply(new double[3], new double[4]);
    }
    @Test(expected=DimensionMismatchException.class)
    public void testEbeDividePrecondition() {
        MathArrays.ebeDivide(new double[3], new double[4]);
    }

    @Test
    public void testEbeAdd() {
        final double[] a = { 0, 1, 2 };
        final double[] b = { 3, 5, 7 };
        final double[] r = MathArrays.ebeAdd(a, b);

        for (int i = 0; i < a.length; i++) {
            Assert.assertEquals(a[i] + b[i], r[i], 0);
        }
    }
    @Test
    public void testEbeSubtract() {
        final double[] a = { 0, 1, 2 };
        final double[] b = { 3, 5, 7 };
        final double[] r = MathArrays.ebeSubtract(a, b);

        for (int i = 0; i < a.length; i++) {
            Assert.assertEquals(a[i] - b[i], r[i], 0);
        }
    }
    @Test
    public void testEbeMultiply() {
        final double[] a = { 0, 1, 2 };
        final double[] b = { 3, 5, 7 };
        final double[] r = MathArrays.ebeMultiply(a, b);

        for (int i = 0; i < a.length; i++) {
            Assert.assertEquals(a[i] * b[i], r[i], 0);
        }
    }
    @Test
    public void testEbeDivide() {
        final double[] a = { 0, 1, 2 };
        final double[] b = { 3, 5, 7 };
        final double[] r = MathArrays.ebeDivide(a, b);

        for (int i = 0; i < a.length; i++) {
            Assert.assertEquals(a[i] / b[i], r[i], 0);
        }
    }

    @Test
    public void testL1DistanceDouble() {
        double[] p1 = { 2.5,  0.0 };
        double[] p2 = { -0.5, 4.0 };
        Assert.assertTrue(Precision.equals(7.0, MathArrays.distance1(p1, p2), 1));
    }

    @Test
    public void testL1DistanceInt() {
        int[] p1 = { 3, 0 };
        int[] p2 = { 0, 4 };
        Assert.assertEquals(7, MathArrays.distance1(p1, p2));
    }

    @Test
    public void testL2DistanceDouble() {
        double[] p1 = { 2.5,  0.0 };
        double[] p2 = { -0.5, 4.0 };
        Assert.assertTrue(Precision.equals(5.0, MathArrays.distance(p1, p2), 1));
    }

    @Test
    public void testL2DistanceInt() {
        int[] p1 = { 3, 0 };
        int[] p2 = { 0, 4 };
        Assert.assertTrue(Precision.equals(5, MathArrays.distance(p1, p2), 1));
    }

    @Test
    public void testLInfDistanceDouble() {
        double[] p1 = { 2.5,  0.0 };
        double[] p2 = { -0.5, 4.0 };
        Assert.assertTrue(Precision.equals(4.0, MathArrays.distanceInf(p1, p2), 1));
    }

    @Test
    public void testLInfDistanceInt() {
        int[] p1 = { 3, 0 };
        int[] p2 = { 0, 4 };
        Assert.assertEquals(4, MathArrays.distanceInf(p1, p2));
    }

    @Test
    public void testCosAngle2D() {
        double expected;

        final double[] v1 = { 1, 0 };
        expected = 1;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v1), 0d);

        final double[] v2 = { 0, 1 };
        expected = 0;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v2), 0d);

        final double[] v3 = { 7, 7 };
        expected = Math.sqrt(2) / 2;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v3), 1e-15);
        Assert.assertEquals(expected, MathArrays.cosAngle(v3, v2), 1e-15);

        final double[] v4 = { -5, 0 };
        expected = -1;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v4), 0);

        final double[] v5 = { -100, 100 };
        expected = 0;
        Assert.assertEquals(expected, MathArrays.cosAngle(v3, v5), 0);
    }

    @Test
    public void testCosAngle3D() {
        double expected;

        final double[] v1 = { 1, 1, 0 };
        expected = 1;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v1), 1e-15);

        final double[] v2 = { 1, 1, 1 };
        expected = Math.sqrt(2) / Math.sqrt(3);
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v2), 1e-15);
    }

    @Test
    public void testCosAngleExtreme() {
        double expected;

        final double tiny = 1e-200;
        final double[] v1 = { tiny, tiny };
        final double big = 1e200;
        final double[] v2 = { -big, -big };
        expected = -1;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v2), 1e-15);

        final double[] v3 = { big, -big };
        expected = 0;
        Assert.assertEquals(expected, MathArrays.cosAngle(v1, v3), 1e-15);
    }

    @Test
    public void testCheckOrder() {
        MathArrays.checkOrder(new double[] {-15, -5.5, -1, 2, 15},
                             MathArrays.OrderDirection.INCREASING, true);
        MathArrays.checkOrder(new double[] {-15, -5.5, -1, 2, 2},
                             MathArrays.OrderDirection.INCREASING, false);
        MathArrays.checkOrder(new double[] {3, -5.5, -11, -27.5},
                             MathArrays.OrderDirection.DECREASING, true);
        MathArrays.checkOrder(new double[] {3, 0, 0, -5.5, -11, -27.5},
                             MathArrays.OrderDirection.DECREASING, false);

        try {
            MathArrays.checkOrder(new double[] {-15, -5.5, -1, -1, 2, 15},
                                 MathArrays.OrderDirection.INCREASING, true);
            Assert.fail("an exception should have been thrown");
        } catch (NonMonotonicSequenceException e) {
            // Expected
        }
        try {
            MathArrays.checkOrder(new double[] {-15, -5.5, -1, -2, 2},
                                 MathArrays.OrderDirection.INCREASING, false);
            Assert.fail("an exception should have been thrown");
        } catch (NonMonotonicSequenceException e) {
            // Expected
        }
        try {
            MathArrays.checkOrder(new double[] {3, 3, -5.5, -11, -27.5},
                                 MathArrays.OrderDirection.DECREASING, true);
            Assert.fail("an exception should have been thrown");
        } catch (NonMonotonicSequenceException e) {
            // Expected
        }
        try {
            MathArrays.checkOrder(new double[] {3, -1, 0, -5.5, -11, -27.5},
                                 MathArrays.OrderDirection.DECREASING, false);
            Assert.fail("an exception should have been thrown");
        } catch (NonMonotonicSequenceException e) {
            // Expected
        }
        try {
            MathArrays.checkOrder(new double[] {3, 0, -5.5, -11, -10},
                                 MathArrays.OrderDirection.DECREASING, false);
            Assert.fail("an exception should have been thrown");
        } catch (NonMonotonicSequenceException e) {
            // Expected
        }
    }

    @Test
    public void testIsMonotonic() {
        Assert.assertFalse(MathArrays.isMonotonic(new double[] { -15, -5.5, -1, -1, 2, 15 },
                                                  MathArrays.OrderDirection.INCREASING, true));
        Assert.assertTrue(MathArrays.isMonotonic(new double[] { -15, -5.5, -1, 0, 2, 15 },
                                                 MathArrays.OrderDirection.INCREASING, true));
        Assert.assertFalse(MathArrays.isMonotonic(new double[] { -15, -5.5, -1, -2, 2 },
                                                  MathArrays.OrderDirection.INCREASING, false));
        Assert.assertTrue(MathArrays.isMonotonic(new double[] { -15, -5.5, -1, -1, 2 },
                                                 MathArrays.OrderDirection.INCREASING, false));
        Assert.assertFalse(MathArrays.isMonotonic(new double[] { 3, 3, -5.5, -11, -27.5 },
                                                  MathArrays.OrderDirection.DECREASING, true));
        Assert.assertTrue(MathArrays.isMonotonic(new double[] { 3, 2, -5.5, -11, -27.5 },
                                                 MathArrays.OrderDirection.DECREASING, true));
        Assert.assertFalse(MathArrays.isMonotonic(new double[] { 3, -1, 0, -5.5, -11, -27.5 },
                                                  MathArrays.OrderDirection.DECREASING, false));
        Assert.assertTrue(MathArrays.isMonotonic(new double[] { 3, 0, 0, -5.5, -11, -27.5 },
                                                 MathArrays.OrderDirection.DECREASING, false));
    }

    @Test
    public void testIsMonotonicComparable() {
        Assert.assertFalse(MathArrays.isMonotonic(new Double[] { new Double(-15),
                                                                 new Double(-5.5),
                                                                 new Double(-1),
                                                                 new Double(-1),
                                                                 new Double(2),
                                                                 new Double(15) },
                MathArrays.OrderDirection.INCREASING, true));
        Assert.assertTrue(MathArrays.isMonotonic(new Double[] { new Double(-15),
                                                                new Double(-5.5),
                                                                new Double(-1),
                                                                new Double(0),
                                                                new Double(2),
                                                                new Double(15) },
                MathArrays.OrderDirection.INCREASING, true));
        Assert.assertFalse(MathArrays.isMonotonic(new Double[] { new Double(-15),
                                                                 new Double(-5.5),
                                                                 new Double(-1),
                                                                 new Double(-2),
                                                                 new Double(2) },
                MathArrays.OrderDirection.INCREASING, false));
        Assert.assertTrue(MathArrays.isMonotonic(new Double[] { new Double(-15),
                                                                new Double(-5.5),
                                                                new Double(-1),
                                                                new Double(-1),
                                                                new Double(2) },
                MathArrays.OrderDirection.INCREASING, false));
        Assert.assertFalse(MathArrays.isMonotonic(new Double[] { new Double(3),
                                                                 new Double(3),
                                                                 new Double(-5.5),
                                                                 new Double(-11),
                                                                 new Double(-27.5) },
                MathArrays.OrderDirection.DECREASING, true));
        Assert.assertTrue(MathArrays.isMonotonic(new Double[] { new Double(3),
                                                                new Double(2),
                                                                new Double(-5.5),
                                                                new Double(-11),
                                                                new Double(-27.5) },
                MathArrays.OrderDirection.DECREASING, true));
        Assert.assertFalse(MathArrays.isMonotonic(new Double[] { new Double(3),
                                                                 new Double(-1),
                                                                 new Double(0),
                                                                 new Double(-5.5),
                                                                 new Double(-11),
                                                                 new Double(-27.5) },
                MathArrays.OrderDirection.DECREASING, false));
        Assert.assertTrue(MathArrays.isMonotonic(new Double[] { new Double(3),
                                                                new Double(0),
                                                                new Double(0),
                                                                new Double(-5.5),
                                                                new Double(-11),
                                                                new Double(-27.5) },
                MathArrays.OrderDirection.DECREASING, false));
    }

    @Test
    public void testCheckRectangular() {
        final long[][] rect = new long[][] {{0, 1}, {2, 3}};
        final long[][] ragged = new long[][] {{0, 1}, {2}};
        final long[][] nullArray = null;
        final long[][] empty = new long[][] {};
        MathArrays.checkRectangular(rect);
        MathArrays.checkRectangular(empty);
        try {
            MathArrays.checkRectangular(ragged);
            Assert.fail("Expecting DimensionMismatchException");
        } catch (DimensionMismatchException ex) {
            // Expected
        }
        try {
            MathArrays.checkRectangular(nullArray);
            Assert.fail("Expecting NullArgumentException");
        } catch (NullArgumentException ex) {
            // Expected
        }
    }

    @Test
    public void testCheckPositive() {
        final double[] positive = new double[] {1, 2, 3};
        final double[] nonNegative = new double[] {0, 1, 2};
        final double[] nullArray = null;
        final double[] empty = new double[] {};
        MathArrays.checkPositive(positive);
        MathArrays.checkPositive(empty);
        try {
            MathArrays.checkPositive(nullArray);
            Assert.fail("Expecting NullPointerException");
        } catch (NullPointerException ex) {
            // Expected
        }
        try {
            MathArrays.checkPositive(nonNegative);
            Assert.fail("Expecting NotStrictlyPositiveException");
        } catch (NotStrictlyPositiveException ex) {
            // Expected
        }
    }

    @Test
    public void testCheckNonNegative() {
        final long[] nonNegative = new long[] {0, 1};
        final long[] hasNegative = new long[] {-1};
        final long[] nullArray = null;
        final long[] empty = new long[] {};
        MathArrays.checkNonNegative(nonNegative);
        MathArrays.checkNonNegative(empty);
        try {
            MathArrays.checkNonNegative(nullArray);
            Assert.fail("Expecting NullPointerException");
        } catch (NullPointerException ex) {
            // Expected
        }
        try {
            MathArrays.checkNonNegative(hasNegative);
            Assert.fail("Expecting NotPositiveException");
        } catch (NotPositiveException ex) {
            // Expected
        }
    }

    @Test
    public void testCheckNonNegative2D() {
        final long[][] nonNegative = new long[][] {{0, 1}, {1, 0}};
        final long[][] hasNegative = new long[][] {{-1}, {0}};
        final long[][] nullArray = null;
        final long[][] empty = new long[][] {};
        MathArrays.checkNonNegative(nonNegative);
        MathArrays.checkNonNegative(empty);
        try {
            MathArrays.checkNonNegative(nullArray);
            Assert.fail("Expecting NullPointerException");
        } catch (NullPointerException ex) {
            // Expected
        }
        try {
            MathArrays.checkNonNegative(hasNegative);
            Assert.fail("Expecting NotPositiveException");
        } catch (NotPositiveException ex) {
            // Expected
        }
    }

    @Test
    public void testCheckNotNaN() {
        final double[] withoutNaN = { Double.NEGATIVE_INFINITY,
                                      -Double.MAX_VALUE,
                                      -1, 0,
                                      Double.MIN_VALUE,
                                      FastMath.ulp(1d),
                                      1, 3, 113, 4769,
                                      Double.MAX_VALUE,
                                      Double.POSITIVE_INFINITY };

        final double[] withNaN = { Double.NEGATIVE_INFINITY,
                                   -Double.MAX_VALUE,
                                   -1, 0,
                                   Double.MIN_VALUE,
                                   FastMath.ulp(1d),
                                   1, 3, 113, 4769,
                                   Double.MAX_VALUE,
                                   Double.POSITIVE_INFINITY,
                                   Double.NaN };


        final double[] nullArray = null;
        final double[] empty = new double[] {};
        MathArrays.checkNotNaN(withoutNaN);
        MathArrays.checkNotNaN(empty);
        try {
            MathArrays.checkNotNaN(nullArray);
            Assert.fail("Expecting NullPointerException");
        } catch (NullPointerException ex) {
            // Expected
        }
        try {
            MathArrays.checkNotNaN(withNaN);
            Assert.fail("Expecting NotANumberException");
        } catch (NotANumberException ex) {
            // Expected
        }
    }

    @Test(expected=DimensionMismatchException.class)
    public void testCheckEqualLength1() {
        MathArrays.checkEqualLength(new double[] {1, 2, 3},
                                    new double[] {1, 2, 3, 4});
    }

    @Test
    public void testCheckEqualLength2() {
        final double[] a = new double[] {-1, -12, -23, -34};
        final double[] b = new double[] {56, 67, 78, 89};
        Assert.assertTrue(MathArrays.checkEqualLength(a, b, false));
    }

    @Test
    public void testSortInPlace() {
        final double[] x1 = {2,   5,  -3, 1,  4};
        final double[] x2 = {4,  25,   9, 1, 16};
        final double[] x3 = {8, 125, -27, 1, 64};

        MathArrays.sortInPlace(x1, x2, x3);

        Assert.assertEquals(-3,  x1[0], FastMath.ulp(1d));
        Assert.assertEquals(9,   x2[0], FastMath.ulp(1d));
        Assert.assertEquals(-27, x3[0], FastMath.ulp(1d));

        Assert.assertEquals(1, x1[1], FastMath.ulp(1d));
        Assert.assertEquals(1, x2[1], FastMath.ulp(1d));
        Assert.assertEquals(1, x3[1], FastMath.ulp(1d));

        Assert.assertEquals(2, x1[2], FastMath.ulp(1d));
        Assert.assertEquals(4, x2[2], FastMath.ulp(1d));
        Assert.assertEquals(8, x3[2], FastMath.ulp(1d));

        Assert.assertEquals(4,  x1[3], FastMath.ulp(1d));
        Assert.assertEquals(16, x2[3], FastMath.ulp(1d));
        Assert.assertEquals(64, x3[3], FastMath.ulp(1d));

        Assert.assertEquals(5,   x1[4], FastMath.ulp(1d));
        Assert.assertEquals(25,  x2[4], FastMath.ulp(1d));
        Assert.assertEquals(125, x3[4], FastMath.ulp(1d));
    }

    @Test
    public void testSortInPlaceDecresasingOrder() {
        final double[] x1 = {2,   5,  -3, 1,  4};
        final double[] x2 = {4,  25,   9, 1, 16};
        final double[] x3 = {8, 125, -27, 1, 64};

        MathArrays.sortInPlace(x1,
                               MathArrays.OrderDirection.DECREASING,
                               x2, x3);

        Assert.assertEquals(-3,  x1[4], FastMath.ulp(1d));
        Assert.assertEquals(9,   x2[4], FastMath.ulp(1d));
        Assert.assertEquals(-27, x3[4], FastMath.ulp(1d));

        Assert.assertEquals(1, x1[3], FastMath.ulp(1d));
        Assert.assertEquals(1, x2[3], FastMath.ulp(1d));
        Assert.assertEquals(1, x3[3], FastMath.ulp(1d));

        Assert.assertEquals(2, x1[2], FastMath.ulp(1d));
        Assert.assertEquals(4, x2[2], FastMath.ulp(1d));
        Assert.assertEquals(8, x3[2], FastMath.ulp(1d));

        Assert.assertEquals(4,  x1[1], FastMath.ulp(1d));
        Assert.assertEquals(16, x2[1], FastMath.ulp(1d));
        Assert.assertEquals(64, x3[1], FastMath.ulp(1d));

        Assert.assertEquals(5,   x1[0], FastMath.ulp(1d));
        Assert.assertEquals(25,  x2[0], FastMath.ulp(1d));
        Assert.assertEquals(125, x3[0], FastMath.ulp(1d));
    }

    @Test
    /** Example in javadoc */
    public void testSortInPlaceExample() {
        final double[] x = {3, 1, 2};
        final double[] y = {1, 2, 3};
        final double[] z = {0, 5, 7};
        MathArrays.sortInPlace(x, y, z);
        final double[] sx = {1, 2, 3};
        final double[] sy = {2, 3, 1};
        final double[] sz = {5, 7, 0};
        Assert.assertTrue(Arrays.equals(sx, x));
        Assert.assertTrue(Arrays.equals(sy, y));
        Assert.assertTrue(Arrays.equals(sz, z));
    }

    @Test
    public void testSortInPlaceFailures() {
        final double[] nullArray = null;
        final double[] one = {1};
        final double[] two = {1, 2};
        final double[] onep = {2};
        try {
            MathArrays.sortInPlace(one, two);
            Assert.fail("Expecting DimensionMismatchException");
        } catch (DimensionMismatchException ex) {
            // expected
        }
        try {
            MathArrays.sortInPlace(one, nullArray);
            Assert.fail("Expecting NullArgumentException");
        } catch (NullArgumentException ex) {
            // expected
        }
        try {
            MathArrays.sortInPlace(one, onep, nullArray);
            Assert.fail("Expecting NullArgumentException");
        } catch (NullArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testCopyOfInt() {
        final int[] source = { Integer.MIN_VALUE,
                               -1, 0, 1, 3, 113, 4769,
                               Integer.MAX_VALUE };
        final int[] dest = MathArrays.copyOf(source);

        Assert.assertEquals(dest.length, source.length);
        for (int i = 0; i < source.length; i++) {
            Assert.assertEquals(source[i], dest[i]);
        }
    }

    @Test
    public void testCopyOfInt2() {
        final int[] source = { Integer.MIN_VALUE,
                               -1, 0, 1, 3, 113, 4769,
                               Integer.MAX_VALUE };
        final int offset = 3;
        final int[] dest = MathArrays.copyOf(source, source.length - offset);

        Assert.assertEquals(dest.length, source.length - offset);
        for (int i = 0; i < source.length - offset; i++) {
            Assert.assertEquals(source[i], dest[i]);
        }
    }

    @Test
    public void testCopyOfInt3() {
        final int[] source = { Integer.MIN_VALUE,
                               -1, 0, 1, 3, 113, 4769,
                               Integer.MAX_VALUE };
        final int offset = 3;
        final int[] dest = MathArrays.copyOf(source, source.length + offset);

        Assert.assertEquals(dest.length, source.length + offset);
        for (int i = 0; i < source.length; i++) {
            Assert.assertEquals(source[i], dest[i]);
        }
        for (int i = source.length; i < source.length + offset; i++) {
            Assert.assertEquals(0, dest[i], 0);
        }
    }

    @Test
    public void testCopyOfDouble() {
        final double[] source = { Double.NEGATIVE_INFINITY,
                                  -Double.MAX_VALUE,
                                  -1, 0,
                                  Double.MIN_VALUE,
                                  FastMath.ulp(1d),
                                  1, 3, 113, 4769,
                                  Double.MAX_VALUE,
                                  Double.POSITIVE_INFINITY };
        final double[] dest = MathArrays.copyOf(source);

        Assert.assertEquals(dest.length, source.length);
        for (int i = 0; i < source.length; i++) {
            Assert.assertEquals(source[i], dest[i], 0);
        }
    }

    @Test
    public void testCopyOfDouble2() {
        final double[] source = { Double.NEGATIVE_INFINITY,
                                  -Double.MAX_VALUE,
                                  -1, 0,
                                  Double.MIN_VALUE,
                                  FastMath.ulp(1d),
                                  1, 3, 113, 4769,
                                  Double.MAX_VALUE,
                                  Double.POSITIVE_INFINITY };
        final int offset = 3;
        final double[] dest = MathArrays.copyOf(source, source.length - offset);

        Assert.assertEquals(dest.length, source.length - offset);
        for (int i = 0; i < source.length - offset; i++) {
            Assert.assertEquals(source[i], dest[i], 0);
        }
    }

    @Test
    public void testCopyOfDouble3() {
        final double[] source = { Double.NEGATIVE_INFINITY,
                                  -Double.MAX_VALUE,
                                  -1, 0,
                                  Double.MIN_VALUE,
                                  FastMath.ulp(1d),
                                  1, 3, 113, 4769,
                                  Double.MAX_VALUE,
                                  Double.POSITIVE_INFINITY };
        final int offset = 3;
        final double[] dest = MathArrays.copyOf(source, source.length + offset);

        Assert.assertEquals(dest.length, source.length + offset);
        for (int i = 0; i < source.length; i++) {
            Assert.assertEquals(source[i], dest[i], 0);
        }
        for (int i = source.length; i < source.length + offset; i++) {
            Assert.assertEquals(0, dest[i], 0);
        }
    }

    @Test
    public void testCopyOfRange() {
        final double[] source = { Double.NEGATIVE_INFINITY,
                                  -Double.MAX_VALUE,
                                  -1, 0,
                                  Double.MIN_VALUE,
                                  FastMath.ulp(1d),
                                  1, 3, 113, 4769,
                                  Double.MAX_VALUE,
                                  Double.POSITIVE_INFINITY };
        final int from = 3;
        final int to = source.length + 14;
        final double[] dest = MathArrays.copyOfRange(source, from, to);

        Assert.assertEquals(dest.length, to - from);
        for (int i = from; i < source.length; i++) {
            Assert.assertEquals(source[i], dest[i - from], 0);
        }
        for (int i = source.length; i < dest.length; i++) {
            Assert.assertEquals(0, dest[i - from], 0);
        }
    }

    // MATH-1005
    @Test
    public void testLinearCombinationWithSingleElementArray() {
        final double[] a = { 1.23456789 };
        final double[] b = { 98765432.1 };

        Assert.assertEquals(a[0] * b[0], MathArrays.linearCombination(a, b), 0d);
    }

    @Test
    public void testLinearCombination1() {
        final double[] a = new double[] {
            -1321008684645961.0 / 268435456.0,
            -5774608829631843.0 / 268435456.0,
            -7645843051051357.0 / 8589934592.0
        };
        final double[] b = new double[] {
            -5712344449280879.0 / 2097152.0,
            -4550117129121957.0 / 2097152.0,
            8846951984510141.0 / 131072.0
        };

        final double abSumInline = MathArrays.linearCombination(a[0], b[0],
                                                                a[1], b[1],
                                                                a[2], b[2]);
        final double abSumArray = MathArrays.linearCombination(a, b);

        Assert.assertEquals(abSumInline, abSumArray, 0);
        Assert.assertEquals(-1.8551294182586248737720779899, abSumInline, 1.0e-15);

        final double naive = a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
        Assert.assertTrue(FastMath.abs(naive - abSumInline) > 1.5);

    }

    @Test
    public void testLinearCombination2() {
        // we compare accurate versus naive dot product implementations
        // on regular vectors (i.e. not extreme cases like in the previous test)
        Well1024a random = new Well1024a(553267312521321234l);

        for (int i = 0; i < 10000; ++i) {
            final double ux = 1e17 * random.nextDouble();
            final double uy = 1e17 * random.nextDouble();
            final double uz = 1e17 * random.nextDouble();
            final double vx = 1e17 * random.nextDouble();
            final double vy = 1e17 * random.nextDouble();
            final double vz = 1e17 * random.nextDouble();
            final double sInline = MathArrays.linearCombination(ux, vx,
                                                                uy, vy,
                                                                uz, vz);
            final double sArray = MathArrays.linearCombination(new double[] {ux, uy, uz},
                                                               new double[] {vx, vy, vz});
            Assert.assertEquals(sInline, sArray, 0);
        }
    }

    @Test
    public void testLinearCombinationHuge() {
        int scale = 971;
        final double[] a = new double[] {
                                         -1321008684645961.0 / 268435456.0,
                                         -5774608829631843.0 / 268435456.0,
                                         -7645843051051357.0 / 8589934592.0
                                     };
        final double[] b = new double[] {
                                         -5712344449280879.0 / 2097152.0,
                                         -4550117129121957.0 / 2097152.0,
                                          8846951984510141.0 / 131072.0
                                     };

        double[] scaledA = new double[a.length];
        double[] scaledB = new double[b.length];
        for (int i = 0; i < scaledA.length; ++i) {
            scaledA[i] = FastMath.scalb(a[i], -scale);
            scaledB[i] = FastMath.scalb(b[i], +scale);
        }
        final double abSumInline = MathArrays.linearCombination(scaledA[0], scaledB[0],
                                                                scaledA[1], scaledB[1],
                                                                scaledA[2], scaledB[2]);
        final double abSumArray = MathArrays.linearCombination(scaledA, scaledB);

        Assert.assertEquals(abSumInline, abSumArray, 0);
        Assert.assertEquals(-1.8551294182586248737720779899, abSumInline, 1.0e-15);

        final double naive = scaledA[0] * scaledB[0] + scaledA[1] * scaledB[1] + scaledA[2] * scaledB[2];
        Assert.assertTrue(FastMath.abs(naive - abSumInline) > 1.5);

    }

    @Test
    public void testLinearCombinationInfinite() {
        final double[][] a = new double[][] {
            { 1, 2, 3, 4},
            { 1, Double.POSITIVE_INFINITY, 3, 4},
            { 1, 2, Double.POSITIVE_INFINITY, 4},
            { 1, Double.POSITIVE_INFINITY, 3, Double.NEGATIVE_INFINITY},
            { 1, 2, 3, 4},
            { 1, 2, 3, 4},
            { 1, 2, 3, 4},
            { 1, 2, 3, 4}
        };
        final double[][] b = new double[][] {
            { 1, -2, 3, 4},
            { 1, -2, 3, 4},
            { 1, -2, 3, 4},
            { 1, -2, 3, 4},
            { 1, Double.POSITIVE_INFINITY, 3, 4},
            { 1, -2, Double.POSITIVE_INFINITY, 4},
            { 1, Double.POSITIVE_INFINITY, 3, Double.NEGATIVE_INFINITY},
            { Double.NaN, -2, 3, 4}
        };

        Assert.assertEquals(-3,
                            MathArrays.linearCombination(a[0][0], b[0][0],
                                                         a[0][1], b[0][1]),
                            1.0e-10);
        Assert.assertEquals(6,
                            MathArrays.linearCombination(a[0][0], b[0][0],
                                                         a[0][1], b[0][1],
                                                         a[0][2], b[0][2]),
                            1.0e-10);
        Assert.assertEquals(22,
                            MathArrays.linearCombination(a[0][0], b[0][0],
                                                         a[0][1], b[0][1],
                                                         a[0][2], b[0][2],
                                                         a[0][3], b[0][3]),
                            1.0e-10);
        Assert.assertEquals(22, MathArrays.linearCombination(a[0], b[0]), 1.0e-10);

        Assert.assertEquals(Double.NEGATIVE_INFINITY,
                            MathArrays.linearCombination(a[1][0], b[1][0],
                                                         a[1][1], b[1][1]),
                            1.0e-10);
        Assert.assertEquals(Double.NEGATIVE_INFINITY,
                            MathArrays.linearCombination(a[1][0], b[1][0],
                                                         a[1][1], b[1][1],
                                                         a[1][2], b[1][2]),
                            1.0e-10);
        Assert.assertEquals(Double.NEGATIVE_INFINITY,
                            MathArrays.linearCombination(a[1][0], b[1][0],
                                                         a[1][1], b[1][1],
                                                         a[1][2], b[1][2],
                                                         a[1][3], b[1][3]),
                            1.0e-10);
        Assert.assertEquals(Double.NEGATIVE_INFINITY, MathArrays.linearCombination(a[1], b[1]), 1.0e-10);

        Assert.assertEquals(-3,
                            MathArrays.linearCombination(a[2][0], b[2][0],
                                                         a[2][1], b[2][1]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[2][0], b[2][0],
                                                         a[2][1], b[2][1],
                                                         a[2][2], b[2][2]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[2][0], b[2][0],
                                                         a[2][1], b[2][1],
                                                         a[2][2], b[2][2],
                                                         a[2][3], b[2][3]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY, MathArrays.linearCombination(a[2], b[2]), 1.0e-10);

        Assert.assertEquals(Double.NEGATIVE_INFINITY,
                            MathArrays.linearCombination(a[3][0], b[3][0],
                                                         a[3][1], b[3][1]),
                            1.0e-10);
        Assert.assertEquals(Double.NEGATIVE_INFINITY,
                            MathArrays.linearCombination(a[3][0], b[3][0],
                                                         a[3][1], b[3][1],
                                                         a[3][2], b[3][2]),
                            1.0e-10);
        Assert.assertEquals(Double.NEGATIVE_INFINITY,
                            MathArrays.linearCombination(a[3][0], b[3][0],
                                                         a[3][1], b[3][1],
                                                         a[3][2], b[3][2],
                                                         a[3][3], b[3][3]),
                            1.0e-10);
        Assert.assertEquals(Double.NEGATIVE_INFINITY, MathArrays.linearCombination(a[3], b[3]), 1.0e-10);

        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[4][0], b[4][0],
                                                         a[4][1], b[4][1]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[4][0], b[4][0],
                                                         a[4][1], b[4][1],
                                                         a[4][2], b[4][2]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[4][0], b[4][0],
                                                         a[4][1], b[4][1],
                                                         a[4][2], b[4][2],
                                                         a[4][3], b[4][3]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY, MathArrays.linearCombination(a[4], b[4]), 1.0e-10);

        Assert.assertEquals(-3,
                            MathArrays.linearCombination(a[5][0], b[5][0],
                                                         a[5][1], b[5][1]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[5][0], b[5][0],
                                                         a[5][1], b[5][1],
                                                         a[5][2], b[5][2]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[5][0], b[5][0],
                                                         a[5][1], b[5][1],
                                                         a[5][2], b[5][2],
                                                         a[5][3], b[5][3]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY, MathArrays.linearCombination(a[5], b[5]), 1.0e-10);

        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[6][0], b[6][0],
                                                         a[6][1], b[6][1]),
                            1.0e-10);
        Assert.assertEquals(Double.POSITIVE_INFINITY,
                            MathArrays.linearCombination(a[6][0], b[6][0],
                                                         a[6][1], b[6][1],
                                                         a[6][2], b[6][2]),
                            1.0e-10);
        Assert.assertTrue(Double.isNaN(MathArrays.linearCombination(a[6][0], b[6][0],
                                                                    a[6][1], b[6][1],
                                                                    a[6][2], b[6][2],
                                                                    a[6][3], b[6][3])));
        Assert.assertTrue(Double.isNaN(MathArrays.linearCombination(a[6], b[6])));

        Assert.assertTrue(Double.isNaN(MathArrays.linearCombination(a[7][0], b[7][0],
                                                                    a[7][1], b[7][1])));
        Assert.assertTrue(Double.isNaN(MathArrays.linearCombination(a[7][0], b[7][0],
                                                                    a[7][1], b[7][1],
                                                                    a[7][2], b[7][2])));
        Assert.assertTrue(Double.isNaN(MathArrays.linearCombination(a[7][0], b[7][0],
                                                                    a[7][1], b[7][1],
                                                                    a[7][2], b[7][2],
                                                                    a[7][3], b[7][3])));
        Assert.assertTrue(Double.isNaN(MathArrays.linearCombination(a[7], b[7])));
    }

    @Test
    public void testArrayEquals() {
        Assert.assertFalse(MathArrays.equals(new double[] { 1d }, null));
        Assert.assertFalse(MathArrays.equals(null, new double[] { 1d }));
        Assert.assertTrue(MathArrays.equals((double[]) null, (double[]) null));

        Assert.assertFalse(MathArrays.equals(new double[] { 1d }, new double[0]));
        Assert.assertTrue(MathArrays.equals(new double[] { 1d }, new double[] { 1d }));
        Assert.assertTrue(MathArrays.equals(new double[] { Double.POSITIVE_INFINITY,
                                                           Double.NEGATIVE_INFINITY, 1d, 0d },
                                            new double[] { Double.POSITIVE_INFINITY,
                                                           Double.NEGATIVE_INFINITY, 1d, 0d }));
        Assert.assertFalse(MathArrays.equals(new double[] { Double.NaN },
                                             new double[] { Double.NaN }));
        Assert.assertFalse(MathArrays.equals(new double[] { Double.POSITIVE_INFINITY },
                                             new double[] { Double.NEGATIVE_INFINITY }));
        Assert.assertFalse(MathArrays.equals(new double[] { 1d },
                                             new double[] { FastMath.nextAfter(FastMath.nextAfter(1d, 2d), 2d) }));

    }

    @Test
    public void testArrayEqualsIncludingNaN() {
        Assert.assertFalse(MathArrays.equalsIncludingNaN(new double[] { 1d }, null));
        Assert.assertFalse(MathArrays.equalsIncludingNaN(null, new double[] { 1d }));
        Assert.assertTrue(MathArrays.equalsIncludingNaN((double[]) null, (double[]) null));

        Assert.assertFalse(MathArrays.equalsIncludingNaN(new double[] { 1d }, new double[0]));
        Assert.assertTrue(MathArrays.equalsIncludingNaN(new double[] { 1d }, new double[] { 1d }));
        Assert.assertTrue(MathArrays.equalsIncludingNaN(new double[] { Double.NaN, Double.POSITIVE_INFINITY,
                                                                       Double.NEGATIVE_INFINITY, 1d, 0d },
                                                        new double[] { Double.NaN, Double.POSITIVE_INFINITY,
                                                                       Double.NEGATIVE_INFINITY, 1d, 0d }));
        Assert.assertFalse(MathArrays.equalsIncludingNaN(new double[] { Double.POSITIVE_INFINITY },
                                                         new double[] { Double.NEGATIVE_INFINITY }));
        Assert.assertFalse(MathArrays.equalsIncludingNaN(new double[] { 1d },
                                                         new double[] { FastMath.nextAfter(FastMath.nextAfter(1d, 2d), 2d) }));
    }

    @Test
    public void testNormalizeArray() {
        double[] testValues1 = new double[] {1, 1, 2};
        TestUtils.assertEquals( new double[] {.25, .25, .5},
                                MathArrays.normalizeArray(testValues1, 1),
                                Double.MIN_VALUE);

        double[] testValues2 = new double[] {-1, -1, 1};
        TestUtils.assertEquals( new double[] {1, 1, -1},
                                MathArrays.normalizeArray(testValues2, 1),
                                Double.MIN_VALUE);

        // Ignore NaNs
        double[] testValues3 = new double[] {-1, -1, Double.NaN, 1, Double.NaN};
        TestUtils.assertEquals( new double[] {1, 1,Double.NaN, -1, Double.NaN},
                                MathArrays.normalizeArray(testValues3, 1),
                                Double.MIN_VALUE);

        // Zero sum -> MathArithmeticException
        double[] zeroSum = new double[] {-1, 1};
        try {
            MathArrays.normalizeArray(zeroSum, 1);
            Assert.fail("expecting MathArithmeticException");
        } catch (MathArithmeticException ex) {}

        // Infinite elements -> MathArithmeticException
        double[] hasInf = new double[] {1, 2, 1, Double.NEGATIVE_INFINITY};
        try {
            MathArrays.normalizeArray(hasInf, 1);
            Assert.fail("expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {}

        // Infinite target -> MathIllegalArgumentException
        try {
            MathArrays.normalizeArray(testValues1, Double.POSITIVE_INFINITY);
            Assert.fail("expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {}

        // NaN target -> MathIllegalArgumentException
        try {
            MathArrays.normalizeArray(testValues1, Double.NaN);
            Assert.fail("expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {}
    }

    @Test
    public void testConvolve() {
        /* Test Case (obtained via SciPy)
         * x=[1.2,-1.8,1.4]
         * h=[1,0.8,0.5,0.3]
         * convolve(x,h) -> array([ 1.2 , -0.84,  0.56,  0.58,  0.16,  0.42])
         */
        double[] x1 = { 1.2, -1.8, 1.4 };
        double[] h1 = { 1, 0.8, 0.5, 0.3 };
        double[] y1 = { 1.2, -0.84, 0.56, 0.58, 0.16, 0.42 };
        double tolerance = 1e-13;

        double[] yActual = MathArrays.convolve(x1, h1);
        Assert.assertArrayEquals(y1, yActual, tolerance);

        double[] x2 = { 1, 2, 3 };
        double[] h2 = { 0, 1, 0.5 };
        double[] y2 = { 0, 1, 2.5, 4, 1.5 };

        yActual = MathArrays.convolve(x2, h2);
        Assert.assertArrayEquals(y2, yActual, tolerance);

        try {
            MathArrays.convolve(new double[]{1, 2}, null);
            Assert.fail("an exception should have been thrown");
        } catch (NullArgumentException e) {
            // expected behavior
        }

        try {
            MathArrays.convolve(null, new double[]{1, 2});
            Assert.fail("an exception should have been thrown");
        } catch (NullArgumentException e) {
            // expected behavior
        }

        try {
            MathArrays.convolve(new double[]{1, 2}, new double[]{});
            Assert.fail("an exception should have been thrown");
        } catch (NoDataException e) {
            // expected behavior
        }

        try {
            MathArrays.convolve(new double[]{}, new double[]{1, 2});
            Assert.fail("an exception should have been thrown");
        } catch (NoDataException e) {
            // expected behavior
        }

        try {
            MathArrays.convolve(new double[]{}, new double[]{});
            Assert.fail("an exception should have been thrown");
        } catch (NoDataException e) {
            // expected behavior
        }
    }

    @Test
    public void testShuffleTail() {
        final int[] orig = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        final int[] list = orig.clone();
        final int start = 4;
        MathArrays.shuffle(list, start, MathArrays.Position.TAIL, new Well1024a(7654321L));

        // Ensure that all entries below index "start" did not move.
        for (int i = 0; i < start; i++) {
            Assert.assertEquals(orig[i], list[i]);
        }

        // Ensure that at least one entry has moved.
        boolean ok = false;
        for (int i = start; i < orig.length - 1; i++) {
            if (orig[i] != list[i]) {
                ok = true;
                break;
            }
        }
        Assert.assertTrue(ok);
    }

    @Test
    public void testShuffleHead() {
        final int[] orig = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        final int[] list = orig.clone();
        final int start = 4;
        MathArrays.shuffle(list, start, MathArrays.Position.HEAD, new Well1024a(1234567L));

        // Ensure that all entries above index "start" did not move.
        for (int i = start + 1; i < orig.length; i++) {
            Assert.assertEquals(orig[i], list[i]);
        }

        // Ensure that at least one entry has moved.
        boolean ok = false;
        for (int i = 0; i <= start; i++) {
            if (orig[i] != list[i]) {
                ok = true;
                break;
            }
        }
        Assert.assertTrue(ok);
    }

    @Test
    public void testNatural() {
        final int n = 4;
        final int[] expected = {0, 1, 2, 3};

        final int[] natural = MathArrays.natural(n);
        for (int i = 0; i < n; i++) {
            Assert.assertEquals(expected[i], natural[i]);
        }
    }

    @Test
    public void testNaturalZero() {
        final int[] natural = MathArrays.natural(0);
        Assert.assertEquals(0, natural.length);
    }

    @Test
    public void testSequence() {
        final int size = 4;
        final int start = 5;
        final int stride = 2;
        final int[] expected = {5, 7, 9, 11};

        final int[] seq = MathArrays.sequence(size, start, stride);
        for (int i = 0; i < size; i++) {
            Assert.assertEquals(expected[i], seq[i]);
        }
    }

    @Test
    public void testSequenceZero() {
        final int[] seq = MathArrays.sequence(0, 12345, 6789);
        Assert.assertEquals(0, seq.length);
    }

    @Test
    public void testVerifyValuesPositive() {
        for (int j = 0; j < 6; j++) {
            for (int i = 1; i < (7 - j); i++) {
                Assert.assertTrue(MathArrays.verifyValues(testArray, 0, i));
            }
        }
        Assert.assertTrue(MathArrays.verifyValues(singletonArray, 0, 1));
        Assert.assertTrue(MathArrays.verifyValues(singletonArray, 0, 0, true));
    }

    @Test
    public void testVerifyValuesNegative() {
        Assert.assertFalse(MathArrays.verifyValues(singletonArray, 0, 0));
        Assert.assertFalse(MathArrays.verifyValues(testArray, 0, 0));
        try {
            MathArrays.verifyValues(singletonArray, 2, 1);  // start past end
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(testArray, 0, 7);  // end past end
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(testArray, -1, 1);  // start negative
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(testArray, 0, -1);  // length negative
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(nullArray, 0, 1);  // null array
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(testArray, nullArray, 0, 1);  // null weights array
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(singletonArray, testWeightsArray, 0, 1);  // weights.length != value.length
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
        try {
            MathArrays.verifyValues(testArray, testNegativeWeightsArray, 0, 6);  // can't have negative weights
            Assert.fail("Expecting MathIllegalArgumentException");
        } catch (MathIllegalArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testConcatenate() {
        final double[] u = new double[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        final double[] x = new double[] {0, 1, 2};
        final double[] y = new double[] {3, 4, 5, 6, 7, 8};
        final double[] z = new double[] {9};
        Assert.assertArrayEquals(u, MathArrays.concatenate(x, y, z), 0);
    }

    @Test
    public void testConcatentateSingle() {
        final double[] x = new double[] {0, 1, 2};
        Assert.assertArrayEquals(x, MathArrays.concatenate(x), 0);
    }

    public void testConcatenateEmptyArguments() {
        final double[] x = new double[] {0, 1, 2};
        final double[] y = new double[] {3};
        final double[] z = new double[] {};
        final double[] u = new double[] {0, 1, 2, 3};
        Assert.assertArrayEquals(u,  MathArrays.concatenate(x, z, y), 0);
        Assert.assertArrayEquals(u,  MathArrays.concatenate(x, y, z), 0);
        Assert.assertArrayEquals(u,  MathArrays.concatenate(z, x, y), 0);
        Assert.assertEquals(0,  MathArrays.concatenate(z, z, z).length);
    }

    @Test(expected=NullPointerException.class)
    public void testConcatenateNullArguments() {
        final double[] x = new double[] {0, 1, 2};
        MathArrays.concatenate(x, null);
    }

    @Test
    public void testUnique() {
        final double[] x = {0, 9, 3, 0, 11, 7, 3, 5, -1, -2};
        final double[] values = {11, 9, 7, 5, 3, 0, -1, -2};
        Assert.assertArrayEquals(values, MathArrays.unique(x), 0);
    }

    @Test
    public void testUniqueInfiniteValues() {
        final double [] x = {0, Double.NEGATIVE_INFINITY, 3, Double.NEGATIVE_INFINITY,
            3, Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY};
        final double[] u = {Double.POSITIVE_INFINITY, 3, 0, Double.NEGATIVE_INFINITY};
        Assert.assertArrayEquals(u , MathArrays.unique(x), 0);
    }

    @Test
    public void testUniqueNaNValues() {
        final double[] x = new double[] {10, 2, Double.NaN, Double.NaN, Double.NaN,
            Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY};
        final double[] u = MathArrays.unique(x);
        Assert.assertEquals(5, u.length);
        Assert.assertTrue(Double.isNaN(u[0]));
        Assert.assertEquals(Double.POSITIVE_INFINITY, u[1], 0);
        Assert.assertEquals(10, u[2], 0);
        Assert.assertEquals(2, u[3], 0);
        Assert.assertEquals(Double.NEGATIVE_INFINITY, u[4], 0);
    }

    @Test(expected=NullPointerException.class)
    public void testUniqueNullArgument() {
        MathArrays.unique(null);
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java MathArraysTest.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.