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https://issues.apache.org/jira/browse/MAHOUT-880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161394#comment-13161394
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Lance Norskog commented on MAHOUT-880:
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Another problem I've seen in some places is to just pick one of the values when
there is an overlap. Options would be to pick the left one, or randomly choose
one.
> 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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