[R] load C code into R

Richard Condit rick at eno.princeton.edu
Mon Jun 11 05:52:42 CEST 2001

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.

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

Richard Condit
Smithsonian Tropical Research Institute

r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list