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From "Erik van Ingen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-305) NPE in KMeansPlusPlusClusterer unittest
Date Thu, 22 Oct 2009 06:35:59 GMT
NPE in  KMeansPlusPlusClusterer unittest
----------------------------------------

                 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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