[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:

> Hi,
> Is it possible to pass a matrix object in R to the .C
> function?
> 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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