I hope that someone reading this list can offer some suggestions on how I can
incorporate external C libraries in C functions that I want to call from R. I
have gone through all of the documentation, help files and mailing list
archives and have not been able to find a satisfactory solution.
I have constructed a simple example of the problem, since my "real" program is
much more complex and would bog down discussion. Suppose I want to compute the
value of a Gaussian hypergeometric function using the function in the GSL
library. My C code is:
#include </usr/include/gsl/gsl_sf_hyperg.h>
void gslTestHG (double *a, double *b, double *c, double *x, double *val
) {
*val = gsl_sf_hyperg_2F1(*a,*b,*c,*x);
}
I compile this code (successfully) using R CMD SHLIB gslTest.c and get the
following result
-bash-3.00$ R CMD SHLIB RgslTest.c
gcc -I/usr/lib64/R/include -I/usr/lib64/R/include -I/usr/local/include
-fpic -O2 -g -c RgslTest.c -o RgslTest.o
gcc -shared -L/usr/local/lib64 -o RgslTest.so RgslTest.o
-L/usr/lib64/R/lib -lR
Next, I try to load the shared object into R using dyn.load("RgslTest.so") and
get the following error in R:
> dyn.load("RgslTest.so")
Error in dyn.load(x, as.logical(local), as.logical(now)) :
unable to load shared library
'/mnt/san2/braunm/winshare/braunm/Cpractice/RgslTest.so':
/mnt/san2/braunm/winshare/braunm/Cpractice/RgslTest.so: undefined
symbol: gsl_sf_hyperg_2F1
I am certain that the file path in the #include statement is correct. It looks
like R can't find the gsl function in the C program, even though the compiler
did.
I would greatly appreciate any help you can provide. Many thanks in advance.
Best wishes,
Michael
------------------------------------------
Michael Braun
Assistant Professor of Marketing
MIT Sloan School of Management
38 Memorial Drive, E56-329
Cambridge, MA 02139
[EMAIL PROTECTED]
(617) 253-3436
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