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https://issues.apache.org/jira/browse/MAHOUT-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168111#comment-13168111
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Lance Norskog commented on MAHOUT-923:
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The right way to set the vector class is to use Vector.like() instead of
clone(). Then, copy the old vector into the new vector. clone() is basically
bogus; it was a nice idea that has turned out to have flaws. Vector.like()
allows any kind of Vector to make a different kind, as appropriate. And the
class parameter would override that, but would not be necessary.
> 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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