[R] LiblineaR: accept sparse matrices

[Sam Steingold]

> * Ben Bolker <oobyxre at tznvy.pbz> [2012-11-07 21:51:07 +0000]:
>
> Sam Steingold <sds <at> gnu.org> writes:
>
>> It would be nice if LiblineaR() accepted data in the form of a sparse
>> matrix (it does not accept whatever e1071::read.matrix.csr returns).
>> 
>> It would also be nice if there were functions to read/write files in the
>> native liblinear file format; I am sure the original liblinear library
>> provides at least the input code.
>
>   You appear to have sent this to the general R-help mailing list
> rather than to the maintainer (or maybe you Bcc'd the maintainer)?

It was CCed (not BCCed) to Thibault Helleputte <thelleputte at gmail.com>

>   Sparse matrices are nice, but once you start using sparse matrices
> you have to start worrying about the details of which linear algebra
> operators have been defined for them (e.g. whether the available
> operators allow pivoting, or work on rank-deficient matrices, or ...)
> So it's not always as easy as flipping a switch ...

The library in question is merely a thin layes which passes the data to
the underlying C++ library. The original library comes with a command
line interface which accepts input file in sparse matrix format _ONLY_.


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