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Posted to dev@mahout.apache.org by "Ted Dunning (JIRA)" <ji...@apache.org> on 2011/05/21 00:26:47 UTC
[jira] [Updated] (MAHOUT-692) OnlineSummarizer does not tolerate
fewer than 100 samples
[ https://issues.apache.org/jira/browse/MAHOUT-692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Dunning updated MAHOUT-692:
-------------------------------
Fix Version/s: 0.6
This definitely needs fixing.
> OnlineSummarizer does not tolerate fewer than 100 samples
> ---------------------------------------------------------
>
> Key: MAHOUT-692
> URL: https://issues.apache.org/jira/browse/MAHOUT-692
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.4
> Reporter: Paul Baclace
> Priority: Minor
> Fix For: 0.6
>
>
> If fewer than 100 samples are add()ed to an instance of org.apache.mahout.math.stats.OnlineSummarizer an exception will be thrown during a sort when getQuartile() is called:
> Caused by: java.lang.IndexOutOfBoundsException: from: 0, to: 99, size=89
> at org.apache.mahout.math.list.AbstractList.checkRangeFromTo(AbstractList.java:87)
> at org.apache.mahout.math.list.DoubleArrayList.sortFromTo(DoubleArrayList.java:573)
> at org.apache.mahout.math.stats.OnlineSummarizer.sort(OnlineSummarizer.java:116)
> at org.apache.mahout.math.stats.OnlineSummarizer.getQuartile(OnlineSummarizer.java:129)
> The problem is that sort is on index range 0,99 but 0,n-1 should be used.
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