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https://issues.apache.org/jira/browse/MAHOUT-880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13162254#comment-13162254
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Raphael Cendrillon commented on MAHOUT-880:
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I'm thinking of building this out a bit more, however first I'd be interested
to hear people's thoughts on this, what methods you would find useful for
DistributedRowMatrix, and your own use cases.
Personally I've found that the DistributedRowMatrix and MatrixMultiplicationJob
classes provide a great foundation for writing MapReduce jobs involving
matrices. I think adding a few basic matrix operations, as suggested by Wangda,
could be very helpful so that its not necessary to reinvent the wheel / write
MapReduce jobs from scratch when doing common linear operations. I also find
that being able to do things like matrixA.times(matrixB) makes it easy to
quickly build a process by chaining together MR jobs in a very readable form.
I'd be very interested to hear other people's thoughts on this.
> 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, 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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