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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2011/03/23 14:21:06 UTC
[jira] [Resolved] (MATH-436) KMeansPlusPlusClusterer Exception when
clusters>variables
[ https://issues.apache.org/jira/browse/MATH-436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe resolved MATH-436.
--------------------------------
Resolution: Fixed
Fixed in subversion repository as of r1084577.
Thanks for the patch
> 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
>
> Attachments: MATH-436.patch
>
> Original Estimate: 0.25h
> Remaining Estimate: 0.25h
>
> 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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