All you need to do is to write a fortran-callable wrapper for a C
interface: there are F77_* macros to allow this. They do not work on
every possible platform, but they work on the platforms R runs on
(since building R relies on them).
E.g. intpr (a call to R's print routines from Fortran) provides a good
prototype. It is in src/main/xxxpr.f an print.c (it would be simpler
if Fortran character types were not involved).
I don't suppose you are comtemplating complex variables, but if you
were, a great deal of care is needed in the C/Fortran interfaces.
On Fri, 6 Feb 2009, nas...@uottawa.ca wrote:
I'm planning to try to use Mike Powell's new BOBYQA optimization routine
to see if it is a good candidate to eventually replace Nelder-Mead as the
optim() default. (Don't panic -- this won't happen quickly.) Mike writes
f77 code. After some chasing about, I've realized that because
optimization codes need to call the objective function written in R, they
need to use a language that can do this. C can, Fortran cannot.
There is, however, a package cfortran that allows for mixed coding in C
and Fortran. This might not be the ultimate solution -- e.g., it may not
be Windows usable. However, it could be a useful tool to try out some
programs that are already available in Fortran.
My query is to ask if anyone has experience they can share in using
cfortran.h. I'd also welcome (off-list may be best) input on directions
for improving or at least tidying optim() and many related capabilities in
R.
John Nash
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Brian D. Ripley, rip...@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)
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