[jira] Commented: (MAHOUT-452) Need row and column views and aggregates

["Jake Mannix (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893459#action_12893459 ] 

Jake Mannix commented on MAHOUT-452:
------------------------------------

Hey Ted,

  I haven't had a chance to look at this code, but is it's operating on the purely in-memory matrices, right?  Not on DistributedRowMatrix yet?

> 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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