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https://issues.apache.org/jira/browse/MAHOUT-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149487#comment-13149487
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Jake Mannix commented on MAHOUT-884:
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Ah! So the point is to concatenate the *rows themselves*. This makes much
more sense, yes, I can see wanting to do this.
Then this should be a map-reduce job, not a sequential process, as these
matrices could be really large. Identity mapper + reduce-side join with
concatenation would be the most straightforward scalable way to do it.
> Matrix Concatenate utility
> --------------------------
>
> Key: MAHOUT-884
> URL: https://issues.apache.org/jira/browse/MAHOUT-884
> Project: Mahout
> Issue Type: New Feature
> Components: Integration
> Reporter: Lance Norskog
> Priority: Minor
> Attachments: MAHOUT-884.patch
>
>
> Utility to concatenate matrices stored as SequenceFiles of vectors.
> Each pair in the SequenceFile is the IntWritable row number and a
> VectorWritable.
> The input and output files may skip rows.
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