[Rd] Using Fortran 95 in an R package?

[John Fox]

Dear Brian,

Thank you for this.

John

> -----Original Message-----
> From: r-devel-bounces at r-project.org 
> [mailto:r-devel-bounces at r-project.org] On Behalf Of Prof Brian Ripley
> Sent: Sunday, December 09, 2007 1:05 PM
> To: John Fox
> Cc: r-devel at r-project.org
> Subject: Re: [Rd] Using Fortran 95 in an R package?
> 
> 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
> 
> -- 
> 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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