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https://issues.apache.org/jira/browse/MAHOUT-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149483#comment-13149483
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Dan Brickley commented on MAHOUT-884:
-------------------------------------
My original use case was here:
http://www.searchworkings.org/forum/-/message_boards/view_message/356639
"""I have a matrix of 100,000 items x 30k features; and another of those
same 100,000 items, x however-many different features (from n-gram
collocation extraction). In current app, these are library holdings
and subject codes + extracted phrases. (later these should be 14
million items by somewhat but not shockingly larger feature space, if
that is useful to know)
I'd like to compose these into a larger unified feature matrix, with
same row structure, and with feature columns drawing from both input
matrices. So far in this work I've managed to get by using bin/mahout
rather than firing up Eclipse and messing with Java; I'd be happy to
learn I can continue in this work style. But if custom code is needed
that's fine. Either way, some pointer would be much appreciated..."""
> 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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