[R] load C code into R

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Mon Jun 11 09:52:51 CEST 2001

Richard Condit <rick at eno.princeton.edu> writes:

> 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 
> test.dll.
> In R1022 for Windows, I run
>  >dyn.load("d:/programs/library/test/test.dll")
>  >testr_function(a,x) 
> .C"d:/programs/library/test/test",as.integer(a),as.double(x))
> 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.
> But when I try
>  >testr(10,x)
> 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

Compiling DLLs on Windows is tricky business, especially if you want
to mix and match compilers. Detailed instructions for doing it is
contained in the rw-faq file and readme.packages. There's a strong
recommendation to use the toolkit based on the Mingw32 compiler and
GNU utilities, but Visual C++ should be doable and there's a full
example in readme.packages.

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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