NPE in KMeansPlusPlusClusterer unittest
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Key: MATH-305
URL: https://issues.apache.org/jira/browse/MATH-305
Project: Commons Math
Issue Type: Bug
Affects Versions: Nightly Builds
Environment: java 6, eclipse, apache commons math trunk
Reporter: Erik van Ingen
Fix For: Nightly Builds
When running this unittest, I am facing this NPE:
java.lang.NullPointerException
at
org.apache.commons.math.stat.clustering.KMeansPlusPlusClusterer.assignPointsToClusters(KMeansPlusPlusClusterer.java:91)
This is the unittest:
package org.fao.fisheries.chronicles.calcuation.cluster;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import org.apache.commons.math.stat.clustering.Cluster;
import org.apache.commons.math.stat.clustering.EuclideanIntegerPoint;
import org.apache.commons.math.stat.clustering.KMeansPlusPlusClusterer;
import org.fao.fisheries.chronicles.input.CsvImportProcess;
import org.fao.fisheries.chronicles.input.Top200Csv;
import org.junit.Test;
public class ClusterAnalysisTest {
@Test
public void testPerformClusterAnalysis2() {
KMeansPlusPlusClusterer<EuclideanIntegerPoint> transformer =
new KMeansPlusPlusClusterer<EuclideanIntegerPoint>(
new Random(1746432956321l));
EuclideanIntegerPoint[] points = new EuclideanIntegerPoint[] {
new EuclideanIntegerPoint(new int[] { 1959,
325100 }),
new EuclideanIntegerPoint(new int[] { 1960,
373200 }), };
List<Cluster<EuclideanIntegerPoint>> clusters =
transformer.cluster(Arrays.asList(points), 1, 1);
assertEquals(1, clusters.size());
}
}
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