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 * https://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
18 /*
19 * This is not the original file distributed by the Apache Software Foundation
20 * It has been modified by the Hipparchus project
21 */
22 package org.hipparchus.linear;
23
24 import org.hipparchus.exception.MathIllegalArgumentException;
25 import org.junit.Assert;
26 import org.junit.Test;
27
28 public final class OpenMapRealMatrixTest {
29
30 @Test(expected=MathIllegalArgumentException.class)
31 public void testMath679() {
32 new OpenMapRealMatrix(3, Integer.MAX_VALUE);
33 }
34
35 @Test
36 public void testMath870() {
37 // Caveat: This implementation assumes that, for any {@code x},
38 // the equality {@code x * 0d == 0d} holds. But it is is not true for
39 // {@code NaN}. Moreover, zero entries will lose their sign.
40 // Some operations (that involve {@code NaN} and/or infinities) may
41 // thus give incorrect results.
42 OpenMapRealMatrix a = new OpenMapRealMatrix(3, 3);
43 OpenMapRealMatrix x = new OpenMapRealMatrix(3, 1);
44 x.setEntry(0, 0, Double.NaN);
45 x.setEntry(2, 0, Double.NEGATIVE_INFINITY);
46 OpenMapRealMatrix b = a.multiply(x);
47 for (int i = 0; i < b.getRowDimension(); ++i) {
48 for (int j = 0; j < b.getColumnDimension(); ++j) {
49 // NaNs and infinities have disappeared, this is a limitation of our implementation
50 Assert.assertEquals(0.0, b.getEntry(i, j), 1.0e-20);
51 }
52 }
53 }
54 }