[R] Calling rand_unif() from fortran

Prof Brian D Ripley ripley at stats.ox.ac.uk
Mon Jul 16 08:39:37 CEST 2001

On Sat, 14 Jul 2001, Gregory R. Warnes wrote:

> What is the necesary incantation to call rand_unif() from a fortran
> routine?
> Just inserting rand_unif() into the fortran code compiles OK, but won't
> dyn.load():
> > dyn.load("forest.so")
> Error in dyn.load(x, as.logical(local), as.logical(now)) :
> 	unable to load shared library "/home/warnes/R/forest/forest.so":
>   /home/warnes/R/forest/forest.so: undefined symbol: unif_rand__
> Do I have to write a bit of C code to "wrap" the call using F77_SUB?

Yes.   In general you cannot call C entry points from Fortran.  That
includes GetRNGstate and PutRNGstate which you *must* use too.

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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