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Java example source code file (OpenMapRealMatrixTest.java)

This example Java source code file (OpenMapRealMatrixTest.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

openmaprealmatrix, openmaprealmatrixtest, test

The OpenMapRealMatrixTest.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,
 * 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.NumberIsTooLargeException;
import org.junit.Assert;
import org.junit.Test;

public final class OpenMapRealMatrixTest {

    public void testMath679() {
        new OpenMapRealMatrix(3, Integer.MAX_VALUE);

    public void testMath870() {
        // Caveat: This implementation assumes that, for any {@code x},
        // the equality {@code x * 0d == 0d} holds. But it is is not true for
        // {@code NaN}. Moreover, zero entries will lose their sign.
        // Some operations (that involve {@code NaN} and/or infinities) may
        // thus give incorrect results.
        OpenMapRealMatrix a = new OpenMapRealMatrix(3, 3);
        OpenMapRealMatrix x = new OpenMapRealMatrix(3, 1);
        x.setEntry(0, 0, Double.NaN);
        x.setEntry(2, 0, Double.NEGATIVE_INFINITY);
        OpenMapRealMatrix b = a.multiply(x);
        for (int i = 0; i < b.getRowDimension(); ++i) {
            for (int j = 0; j < b.getColumnDimension(); ++j) {
                // NaNs and infinities have disappeared, this is a limitation of our implementation
                Assert.assertEquals(0.0, b.getEntry(i, j), 1.0e-20);

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