[Rd] Using Fortran 95 in an R package?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sun Dec 9 19:04:44 CET 2007
On Sun, 9 Dec 2007, John Fox wrote:
> Dear R-devel list members,
> What's the best current advice about writing Fortran code for use in R
> packages? The Writing R Extensions manual still says that the .Fortran
> interface is primarily intended for FORTRAN 77 code. In particular, are
> there portability issues if I use Fortran 95 in a package? For example, I
> see that Rtools for Windows now include the gfortran compiler.
Yes, there are still portability issues. We do still see quite a few
people using gcc3/g77 (especially on older Linux and commercial Unices)
and there are further issues if you make use of subprogram names
containing underlines. We don't distribute a cross-building solution for
Windows using gfortran (although one can be built, it will not be mature
until gcc 4.3.x is out).
However, I would not let that deter you: just use .f95 extensions on the
Fortran 95 files and avoid underlines. For Windows users you are
effectively requiring R >= 2.6.0.
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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