[R] Passing a Matrix to .C?
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Mon May 6 06:51:07 CEST 2002
On Mon, 6 May 2002, Jess Mar wrote:
> Is it possible to pass a matrix object in R to the .C
> Moreover is it possible to have .C return a matrix object
> back into R?
No, no. You have two choices
1) (Recommended.) Use .Call: see the examples in `Writing R Extensions'.
2) A matrix is a vector with dimension attributes, so pass the vector and
the dimensions separately. There are lots of examples of that, for example
in nnet. This only needs a little more work, but does involve more
copying of objects.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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