1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.math4.legacy.linear;
18
19 import org.apache.commons.math4.legacy.exception.NumberIsTooLargeException;
20 import org.junit.Assert;
21 import org.junit.Test;
22
23 public final class OpenMapRealMatrixTest {
24
25 @Test(expected=NumberIsTooLargeException.class)
26 public void testMath679() {
27 new OpenMapRealMatrix(3, Integer.MAX_VALUE);
28 }
29
30 @Test
31 public void testMath870() {
32 // Caveat: This implementation assumes that, for any {@code x},
33 // the equality {@code x * 0d == 0d} holds. But it is is not true for
34 // {@code NaN}. Moreover, zero entries will lose their sign.
35 // Some operations (that involve {@code NaN} and/or infinities) may
36 // thus give incorrect results.
37 OpenMapRealMatrix a = new OpenMapRealMatrix(3, 3);
38 OpenMapRealMatrix x = new OpenMapRealMatrix(3, 1);
39 x.setEntry(0, 0, Double.NaN);
40 x.setEntry(2, 0, Double.NEGATIVE_INFINITY);
41 OpenMapRealMatrix b = a.multiply(x);
42 for (int i = 0; i < b.getRowDimension(); ++i) {
43 for (int j = 0; j < b.getColumnDimension(); ++j) {
44 // NaNs and infinities have disappeared, this is a limitation of our implementation
45 Assert.assertEquals(0.0, b.getEntry(i, j), 1.0e-20);
46 }
47 }
48 }
49 }