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From "Raphael Cendrillon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-880) Add some matrix method(like addition, subtraction, norm ... etc) to DistributedRowMatrix
Date Tue, 29 Nov 2011 03:33:39 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Raphael Cendrillon updated MAHOUT-880:
--------------------------------------

    Comment: was deleted

(was: A few matrix-vector operations for DistributedRowMatrix)
    
> 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
>
> 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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