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https://issues.apache.org/jira/browse/MAHOUT-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893494#action_12893494
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Ted Dunning commented on MAHOUT-452:
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Jake,
I should say that aggregateRows and aggregateColumns would probably be very
easy to get working on the DRM.
> Need row and column views and aggregates
> ----------------------------------------
>
> Key: MAHOUT-452
> URL: https://issues.apache.org/jira/browse/MAHOUT-452
> Project: Mahout
> Issue Type: Bug
> Reporter: Ted Dunning
> Attachments: MAHOUT-452.patch, MAHOUT-452.patch, MAHOUT-452.patch
>
>
> It is common to need to sum up the rows of a matrix or to operate on a view
> of a row rather than a copy.
> I just ran into this big time so I implemented these operations.
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