[R] interfacing C into R and R packages

[Torsten Hothorn]

> Hi,
>
> I would like to interface a C code into R. Is it possible to use in the C code, functions from a R package (for instance, to use pmvnorm within loops in the C code and to call the result in  a R function)?

Probably the most easiest way is copying the C-sources from the original
package (that's what GPL is about). In this special case you need to
(re)-write the R high level function `pmvnorm' in C and call the Fortran77
subroutine `MVTDST' from your C-code. However, keep in mind that `MVTDST'
requires significant time for non-trivial problems and you should make
sure that re-coding the interface in C is worth the effort: Note that you
can call R functions from C anyway (Section 4.9 of `Writing R
Extensions').

Best,

Torsten

>
> Nathalie
>
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