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 }