[R] where is internal function of sample()?

[Marc Schwartz]

On Mon, 2005-04-11 at 23:04 -0400, Weijie Cai wrote:
> Hi there,
> 
> I am trying to write a c++ shared library for R. I need a function which has 
> the same functionality as sample() in R, i.e., does permutation, sample 
> with/without replacement. Does R have internal sample routine so that I can 
> call it directly?
> 
> I did not find it in R.h, Rinternal.h.
> 
> Thanks

A quick grep of the source code tree tells you that the function is
in .../src/main/random.c

A general pattern for C .Internal functions is to use a prefix of "do_"
in conjunction with the R function name. So in this case, the C function
is called do_sample and begins at line 391 (for 2.0.1 patched) in the
aforementioned C source file.

HTH,

Marc Schwartz