[jira] [Commented] (MAHOUT-692) OnlineSummarizer does not tolerate fewer than 100 samples

["Ted Dunning (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031553#comment-13031553 ] 

Ted Dunning commented on MAHOUT-692:
------------------------------------

Harumph.  this bug looks familiar.

Let me look to see if I have a fix on a dev branch.

> 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
>
> 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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