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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168414#comment-13168414
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Sean Owen commented on MAHOUT-923:
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clone() can return what it likes, though it is intended to return an object of
the same class. So it *could* do what you describe "legally", even if it
generally doesn't or perhaps shouldn't. What's the flaw that Lance was alluding
to? I am aware of sins in implementation of clone() but nothing that was
actually causing a problem.
> Row mean job for PCA
> --------------------
>
> Key: MAHOUT-923
> URL: https://issues.apache.org/jira/browse/MAHOUT-923
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Affects Versions: 0.6
> Reporter: Raphael Cendrillon
> Assignee: Raphael Cendrillon
> Fix For: Backlog
>
> Attachments: MAHOUT-923.patch, MAHOUT-923.patch
>
>
> Add map reduce job for calculating mean row (column-wise mean) of a
> Distributed Row Matrix for use in PCA.
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