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https://issues.apache.org/jira/browse/MAHOUT-692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-692.
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Resolution: Fixed
Assignee: Ted Dunning
Looks like a very simple fix, to sort the whole "starter" array rather than
sort potentially off the end. While I don't know the logic 100% I understand it
enough at first glance to not see an obvious reason that would be wrong.
> 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
> Assignee: Ted Dunning
> 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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