/*
* 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.hadoop.stochasticsvd;
import org.apache.mahout.common.MahoutTestCase;
import org.apache.mahout.math.DenseMatrix;
import org.apache.mahout.math.DenseVector;
import org.apache.mahout.math.Matrix;
import org.apache.mahout.math.function.Functions;
import org.junit.Test;
public class UpperTriangularTest extends MahoutTestCase {
@Test
public void testBasics() {
Matrix a = new UpperTriangular(new double[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, false);
assertEquals(0, a.viewDiagonal().minus(new DenseVector(new double[]{1, 5, 8, 10})).norm(1), 1.0e-10);
assertEquals(0, a.viewPart(0, 3, 1, 3).viewDiagonal().minus(
new DenseVector(new double[]{2, 6, 9})).norm(1), 1.0e-10);
assertEquals(4, a.get(0, 3), 1.0e-10);
print(a);
Matrix m = new DenseMatrix(4, 4).assign(a);
assertEquals(0, m.minus(a).aggregate(Functions.PLUS, Functions.ABS), 1.0e-10);
print(m);
assertEquals(0, m.transpose().times(m).minus(a.transpose().times(a)).aggregate(
Functions.PLUS, Functions.ABS), 1.0e-10);
assertEquals(0, m.plus(m).minus(a.plus(a)).aggregate(Functions.PLUS, Functions.ABS), 1.0e-10);
}
private static void print(Matrix m) {
for (int i = 0; i < m.rowSize(); i++) {
for (int j = 0; j < m.columnSize(); j++) {
if (Math.abs(m.get(i, j)) > 1.0e-10) {
System.out.printf("%10.3f ", m.get(i, j));
} else {
System.out.printf("%10s ", (i + j) % 3 == 0 ? "." : "");
}
}
System.out.printf("\n");
}
System.out.printf("\n");
}
}