/**
* 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.mahout.math;
import org.apache.mahout.math.function.Functions;
import org.junit.Test;
public class MatrixVectorViewTest extends MahoutTestCase {
/**
* Test for the error reported in https://issues.apache.org/jira/browse/MAHOUT-1146
*/
@Test
public void testColumnView() {
Matrix matrix = new DenseMatrix(5, 3);
Vector column2 = matrix.viewColumn(2);
Matrix outerProduct = column2.cross(column2);
assertEquals(matrix.numRows(), outerProduct.numRows());
assertEquals(matrix.numRows(), outerProduct.numCols());
}
/**
* Test for out of range column or row access.
*/
@Test
public void testIndexRange() {
Matrix m = new DenseMatrix(20, 30).assign(Functions.random());
try {
m.viewColumn(30);
fail("Should have thrown exception");
} catch (IllegalArgumentException e) {
assertTrue(e.getMessage().startsWith("Index 30 is outside allowable"));
}
try {
m.viewRow(20);
fail("Should have thrown exception");
} catch (IllegalArgumentException e) {
assertTrue(e.getMessage().startsWith("Index 20 is outside allowable"));
}
}
}