[MATH-305] NPE in KMeansPlusPlusClusterer unittest

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0
• Fix Version/s: 2.1

Environment

java 6, eclipse, apache commons math trunk

• Assignee: Unassigned
• Reporter: Erik van Ingen
• Created: 22/Oct/09 06:35
• Updated: 30/Nov/09 08:12
• Resolved: 27/Nov/09 21:46

Description

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());

}

}