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From "Erik van Ingen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-436) KMeansPlusPlusClusterer Exception when clusters>variables
Date Thu, 11 Nov 2010 08:25:13 GMT
KMeansPlusPlusClusterer Exception when clusters>variables
---------------------------------------------------------

                 Key: MATH-436
                 URL: https://issues.apache.org/jira/browse/MATH-436
             Project: Commons Math
          Issue Type: Wish
    Affects Versions: 3.0
            Reporter: Erik van Ingen
            Priority: Minor
             Fix For: 3.0


It would be nice when KMeansPlusPlusClusterer generates an exception when the number of cluster
is larger than the number of variables. 

KMeansPlusPlusClustererTest:
 /**
     * 2 variables cannot be clustered into 3 clusters.
     */
    @Test
    public void testPerformClusterAnalysisToManyClusters() {
        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 }), };
        try {
            transformer.cluster(Arrays.asList(points), 3, 1);
            Assert.fail();
        } catch (Exception e) {
            // 2 variables cannot be clustered into 3 clusters.
        }
    }


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