[R] load C code into R
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Jun 11 11:31:35 CEST 2001
On Sun, 10 Jun 2001, Richard Condit wrote:
> I am trying to load C routines into R on windows, going through the the
> book S programming and the R manual, but I know I am missing some steps.
> I created a win32 DLL project in Visual C++ (ver. 6.0). It consists of one
> simple routine named test which accepts one *integer argument and one
> *double argument and performs a trivial computation. The dll is named
> In R1022 for Windows, I run
> These are both accepted, and I can use dyn.unload as well with test.dll. I
> notice that while loaded, Visual C++ cannot recompile test.dll.
Yes, that's a feature of Windows (and some other OSes).
> But when I try
> I get the message Error in .C("test", as.integer(a),as.double(x)) :
> C/Fortran function name not in load table.
> I know I need a link step, or an install step, but I am missing something
> in the instructions. Perhaps just a quick piece of advice could get me to
> the next stage
Your .C call should be something like
.C("test", as.integer(a), as.double(x))
and "test" must be exported by your DLL. Note: by default nothing is
exported in Visual C++: you need a .def file in the project.
I think you've missed the advice in readme.packages (in rw1023sp.zip),
which has a section `Using Visual C++'. Despite the presence of that,
using the recommended compiler is easier....
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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