Hi,
I am writing a function in C that is meant to be called by R. In the C
function, I used a gsl function gsl_stats_mean. The code is as simple as
below
void gsl(double *m, int *dim){
int r, c;
r = dim[0];
c = dim[1];
double mean = gsl_stats_mean(&m[0], 1, r);
Rprintf("mean = %f\n", mean);
}
The C code is succesfully compiled and the output is as follows.
$ R CMD SHLIB hello.c
WARNING: ignoring environment value of R_HOME
gcc -std=gnu99 -I/usr/local/R-2.8.1/lib64/R/include -I/usr/local/include
-fpic -g -O2 -c hello.c -o hello.o
gcc -std=gnu99 -shared -L/usr/local/lib64 -o hello.so hello.o
However, as I tried to load it in R
libPath = "~/ccode"
dyn.load(file.path(libPath, "hello.so"))
I got an error message in R
Error in dyn.load(file.path(libPath, "hello.so")) :
unable to load shared library '~/ccode/hello.so':
~/ccode/hello.so: undefined symbol: gsl_stats_mean
I do have gsl installed and the gls lib folder has both libgsl.a and
libgsl.so.
How I can link the C code with gsl library from R CMD SHLIB?
Any suggestions would be appreciated.
Jeff
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