Message-ID: <1113275800.6103.5.camel@horizons.localdomain>
Date: 2005-04-12T03:16:40Z
From: Marc Schwartz
Subject: where is internal function of sample()?
In-Reply-To: <BAY103-F367BE42EF400A7ED46D038D3330@phx.gbl>
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