On Fri, 1 Feb 2002, Liaw, Andy wrote:
> Dear R-help,
>
> In the R-ext manual, section 5.6 ("Calling C from FORTRAN and vice
versa"),
> it seems like only the "vice versa" part is covered. Can someone
explain
> (or give an example) on how to do this? In particular:
>
> o Is it possible to call the R RNG from Fortran?
> o Is it possible to call the utility routines such as sorting and ranking?
No, no (directly)
You need to write wrappers in C, declaring entry points with F77_SUB (so
it is covered in that section).
void F77_SUB(forrnd)(double *result)
{
result[0] = unif_rand();
}
should do the job for the first (untested).
You may be able to define Fortran functions in C, but that is highly
platform-dependent (including compiler-dependent), as return conventions
are not standardized, and on Windows not even documented.
--
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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