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I am going to be using R for text analysis (mostly clustering, classification and some visualization) and was wondering what mechanisms R provides for handling high dimensional, sparse data sets. If I understand correctly, R does provide some packages (e.g., matrix library) for handling large and sparse matrices - which brings me to my question.

Specifically, I would like to know:

  1. Which R libraries are most appropriate for storing and processing high dimensional sparse data? Just FYI, my data will fit into memory.

  2. Do such libraries inter-operate with existing text analysis (clustering/classification) packages? Would I need to convert these sparse data structures to and from data frames if I need to text analysis? Wouldn't that add additional time overhead to the computations?

I am fairly new to R, so please excuse me if this sounds vague (or too general).

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  • $\begingroup$ Any thoughts on this one? I will appreciate any pointers. Thanks. $\endgroup$ – Andy Nov 20 '11 at 1:54
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This does not help you? http://tiny.cc/ns73n Moreover, you can install sos R package to search any function in R, by using findFn() function in the sos package.

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  • $\begingroup$ Well the problem is that tm library does not scale well. RWeka provides access to only select WEKA functionality (no way to call WEKA feature selection methods, for example). I don't see any other packages that would let you do pre-processing on text data in a scalable fashion. And then there's always this question of how to store and process highly sparse data... $\endgroup$ – Andy Nov 23 '11 at 21:53
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A quick google for R text analysis lead me to the following article in the Journal for Statistical Software from 2008:

Text Mining Infrastructure in R

I'm not sure what is in it exactly, and it might be a bit outdated, but it should be helpful...

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