[jira] [Issue Comment Edited] (MAHOUT-884) Matrix Concatenate utility

["Lance Norskog (Issue Comment Edited) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176527#comment-13176527 ] 

Lance Norskog edited comment on MAHOUT-884 at 12/28/11 9:01 AM:
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Completely redone. Now a Hadoop job which uses Jake's trick of caching the row widths. It supports any Writable as the key class. Input vectors can be in multiple files and out of order. Supports named vectors.

Minuses:
* Only concatenates two matrices
* Hard-coded to SequentialAccessSparseVector with no compression

                
      was (Author: lancenorskog):
    Completely redone. Now a Hadoop job which uses Jake's trick of caching the row widths.
                  
> 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, MAHOUT-884.patch, 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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