On Mon, Jul 16, 2012 at 12:49 PM, Chandler Zuo <z...@stat.wisc.edu> wrote:
> Sorry that I posted the wrong syntax. My initial program is very long and I
> tried to post the section where I have been narrowed to locate the problem.
>
> In this sample I am simulating a Gamma with size parameter 5000 and scale
> parameter 1.
>
> I plugged in many breaks in my initial program and what I found was that
> most of the time the program stops when encountering a call to rgamma()
> function. It just freezes without popping out any error.
>
> #include<Rmath.h>
> #include<time.h>
> #include<Rinternals.h>
>
> SEXP generateGamma ()
> {
> SEXP a;
> PROTECT(a=allocVector(REALSXP,1));
> srand(time(NULL));
> REAL(a)[0]=rgamma(5000,1);
> UNPROTECT(1);
> return (a);
> }
>
srand() isn't relevant to the R random number generator, and you
haven't included the header file that defines it (this should lead to
a warning about implicit declaration).
More importantly, you haven't included the R equivalents GetRNGstate()
and PutRNGstate(). You want something like
#include "R.h"
#include<Rmath.h>
#include<Rinternals.h>
SEXP generateGamma ()
{
SEXP a;
PROTECT(a=allocVector(REALSXP,1));
GetRNGstate();
REAL(a)[0]=rgamma(5000,1);
PutRNGstate();
UNPROTECT(1);
return (a);
}
- thomas
--
Thomas Lumley
Professor of Biostatistics
University of Auckland
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
