/**
* 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.junit.Test;
public class PivotedMatrixTest extends MatrixTest {
@Override
public Matrix matrixFactory(double[][] values) {
Matrix base = new DenseMatrix(values);
// for general tests, we just make a scrambled matrix and fill it
// with the standard data. Then we can test the details of the
// row and/or column swapping separately.
PivotedMatrix pm = new PivotedMatrix(base.like());
pm.swap(0, 1);
pm.swapRows(1, 2);
pm.assign(base);
return pm;
}
@Test
public void testSwap() {
Matrix m = new DenseMatrix(10, 10);
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
m.set(i, j, 10 * i + j);
}
}
PivotedMatrix pm = new PivotedMatrix(m);
pm.swap(3, 5);
assertEquals(0, pm.viewDiagonal().minus(
new DenseVector(new double[]{0, 11, 22, 55, 44, 33, 66, 77, 88, 99})).norm(1), 1.0e-10);
pm.swap(2, 7);
assertEquals(0, pm.viewDiagonal().minus(
new DenseVector(new double[]{0, 11, 77, 55, 44, 33, 66, 22, 88, 99})).norm(1), 1.0e-10);
pm.swap(5, 8);
assertEquals(0, pm.viewColumn(4).minus(
new DenseVector(new double[]{4.0,14.0,74.0,54.0,44.0,84.0,64.0,24.0,34.0,94.0})).norm(1), 1.0e-10);
assertEquals(0, pm.viewDiagonal().minus(
new DenseVector(new double[]{0, 11, 77, 55, 44, 88, 66, 22, 33, 99})).norm(1), 1.0e-10);
}
}