Hello,
Novice programmer.
I'm writing C source code and compiling it in as *.dll in the terminal by R
CMD SHLIB foo.c. It works, I'm on a 64 bits windows system. I have the
lastest R 2.15.0 and Rtools using the gcc 4.6.3 compiler.
However, that was a hello world run, and I installed GSL for the 64 bit
system for fast MCMC. The Rcpp package was easy to use, but I opted for a C
with GSL fashion because a MCMC simulation I'm attempting would have been
astronomically time consuming with the JAGS Sampler. A couple webpages
suggested the C/GSL might be optimal.
My issue is that even though the R CMD SHLIB *c built the *dll for simple
examples, when I installed GSL for the (64 bit system), the R CMD -lgsl
-lgslcblas *c returns a fatal error: gsl/gsl_rng.h no such file or directory
exists. My paths are:
Does the order matter? I think Rtools needed to go first (in their order) in
the path list.
PATH =
c:\R\Rtools\bin;c:\R\Rtools\gcc-4.6.3\bin;C:/R/R-2.15.0/bin/x64;C:\Program
Files (x86)\MiKTeX 2.8\miktex\bin;C:\Program Files\Common Files\Microsoft
Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft
Shared\Windows
Live;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program
Files\SAS\SharedFiles(32)\Formats;C:\Program Files (x86)\Windows
Live\Shared;C:\Program Files
(x86)\QuickTime\QTSystem\;C:\R\batchfiles_0.6-6;C:/R/GSL_test2/bin
I also created two new variables in the system environmental variables list
GSL_LIB, value c:/R/GSL_test2/lib/
GSL_INC, value c:/R/GSL_test2/inc/
The source C code is
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>
#include <R.h>
void gibbsGSL(int *Np,int *thinp,int *seedp,double *xvec,double *yvec) {
int i,j;
int N=*Np,thin=*thinp,seed=*seedp;
gsl_rng *r = gsl_rng_alloc(gsl_rng_mt19937);
gsl_rng_set(r,seed);
double x=0;
double y=0;
for (i=0;i<N;i++) {
for (j=0;j<thin;j++) {
x=gsl_ran_gamma(r,3.0,1.0/(y*y+4));
y=1.0/(x+1)+gsl_ran_gaussian(r,1.0/sqrt(2*x+2));
}
xvec[i]=x; yvec[i]=y;
}
}
Any advice would be appreciated.
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