On 19 November 2009 at 20:29, Hao Cen wrote:
| 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.
Set the PKG_LIBS variable as you would in src/Makevars for a package, i.e.
$ PKG_LIBS="-lgsl -lblas" R CMD SHLIB hello.c
maybe all it takes. You may need to add PKG_CPPFLAGS as well if you need
-I... for include directories.
See the 'R Extensions' manual for more, and / or some of the CRAN packages
that wrap GSL code.
Dirk
--
Three out of two people have difficulties with fractions.
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