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Date: Tue, 29 Nov 2011 04:47:40 +0000 (UTC)
From: "Raphael Cendrillon (Commented) (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
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Subject: [jira] [Commented] (MAHOUT-880) Add some matrix method(like
 addition, subtraction, norm ... etc) to DistributedRowMatrix
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    [ https://issues.apache.org/jira/browse/MAHOUT-880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159082#comment-13159082 ] 

Raphael Cendrillon commented on MAHOUT-880:
-------------------------------------------

Hi Jake. If you get a chance could you take a look through the attached patch? Your feedback would be great.
                
> Add some matrix method(like addition, subtraction, norm ... etc) to DistributedRowMatrix
> ----------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-880
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-880
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Math
>    Affects Versions: 0.6
>            Reporter: Wangda Tan
>            Priority: Minor
>              Labels: DistributedRowMatrix
>         Attachments: MAHOUT-880.patch
>
>
> I'm a new to Mahout, I didn't find some basic matrix functions. This make users cannot do many tasks by CLI or API, if user get some result through existing map-reduce matrix operation (like svd), he cannot do farther steps. I make a list for it:
> 1) Addition, Subtraction 
> 2) Norm (like norm-1, norm-2, norm-frobenius)
> 3) Matrix compare
> 4) Get lower triangle, upper triangle and diagonal
> 5) Get identity and zero matrix
> 6) Put two or matrix to together: A = [A1, A2]
> 7) More linear equations solver method, like Gaussian elimination (maybe it's hard to implement)
> 8) import and export CSV, ARFF ... (this will very useful when user want to reuse result from or to other applications like MATLAB)
> I want to know is there any plan to do this, if so, I can make some efforts to implement these.

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