Author: tdunning
Date: Thu Dec 22 23:51:31 2011
New Revision: 1222514
URL: http://svn.apache.org/viewvc?rev=1222514&view=rev
Log:
MAHOUT-792 - Additional test for QR decomposition.
Modified:
mahout/trunk/math/src/test/java/org/apache/mahout/math/QRDecompositionTest.java
Modified:
mahout/trunk/math/src/test/java/org/apache/mahout/math/QRDecompositionTest.java
URL:
http://svn.apache.org/viewvc/mahout/trunk/math/src/test/java/org/apache/mahout/math/QRDecompositionTest.java?rev=1222514&r1=1222513&r2=1222514&view=diff
==============================================================================
---
mahout/trunk/math/src/test/java/org/apache/mahout/math/QRDecompositionTest.java
(original)
+++
mahout/trunk/math/src/test/java/org/apache/mahout/math/QRDecompositionTest.java
Thu Dec 22 23:51:31 2011
@@ -17,10 +17,27 @@
package org.apache.mahout.math;
+import org.apache.mahout.math.function.DoubleDoubleFunction;
import org.apache.mahout.math.function.Functions;
import org.junit.Test;
public final class QRDecompositionTest extends MahoutTestCase {
+ @Test
+ public void rank1() {
+ Matrix x = new DenseMatrix(3, 3);
+ x.viewRow(0).assign(new double[]{1, 2, 3});
+ x.viewRow(1).assign(new double[]{2, 4, 6});
+ x.viewRow(2).assign(new double[]{3, 6, 9});
+
+ QRDecomposition qr = new QRDecomposition(x);
+ assertFalse(qr.hasFullRank());
+ assertEquals(0, new DenseVector(new double[]{3.741657, 7.483315,
11.22497}).aggregate(qr.getR().viewRow(0), Functions.PLUS, new
DoubleDoubleFunction() {
+ @Override
+ public double apply(double arg1, double arg2) {
+ return Math.abs(arg1) - Math.abs(arg2);
+ }
+ }), 1e-5);
+ }
@Test
public void fullRankTall() {
