Hello,

The next release of LiblineaR should offer the possibility of using sparse
matrices. However, the next release date is not fixed yet...

On Thu, Nov 8, 2012 at 10:07 PM, Sam Steingold <sds@gnu.org> wrote:

> > * Ben Bolker <oobyxre@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@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_.
>
>
> --
> Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X
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