[R] Where to find source of C_pbinom?

[Ranjan Maitra]

Hi,

I have not followed the e-mail trail, but if you are looking for the C
source code for pbinom, then it is pbinom.c in src/nmath.

HTH,
Ranjan


On Wed, 27 Aug 2014 08:34:11 -0400 Marius Hofert
<marius.hofert at math.ethz.ch> wrote:

> Dear Sarah, Dear David,
> 
> thanks for helping. I know the FAQ and I know the R News article, but
> I still couldn't figure it out. First, pbinom calls
> .External(C_pbinom,...). Grepping for C_pbinom reveals... nothing
> (except the appearance in .External). Going to ./src/main/names.c
> reveals "{"pbinom", do_math3, 5, 11, 3+2, {PP_FUNCALL, PREC_FN, 0}},",
> so the next step is to grep for do_math3 (which also applies for
> "dbeta", "pbeta",..., "qnbinom_mu"). There is a connection to pbinom
> again in ./src/main/arithmetic.c (SEXP attribute_hidden do_math3):
> Math3_2(args, pbinom) is called. src/library/stats/src/distn.c then
> shows that "Math3_2(args, pbinom)" is called. Since we just already
> grepped for Math3_2, the trip ends here.
> 
> So how can one find the source code of pbinom() in this case?
> 
> Cheers,
> 
> Marius
> 
> 
> On Wed, Aug 27, 2014 at 7:28 AM, Sarah Goslee <sarah.goslee at gmail.com> wrote:
> > R FAQ 7.40
> >
> > http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-do-I-access-the-source-code-for-a-function_003f
> >
> > Sarah
> >
> >
> > On Tuesday, August 26, 2014, Marius Hofert <marius.hofert at math.ethz.ch>
> > wrote:
> >>
> >> Dear expeRts,
> >>
> >> I would like to find out how R computes pbinom(). A grep in the
> >> source code reveiled src/library/stats/R/distn.R:146:
> >> .External(C_pbinom, q, size, prob, lower.tail, log.p), so
> >> 'C_pbinom' refers to compiled C/C++ code loaded into R. Where can
> >> I find the source code of C_pbinom?
> >>
> >> Cheers,
> >>
> >> Marius
> >>
> >
> >
> > --
> > Sarah Goslee
> > http://www.stringpage.com
> > http://www.sarahgoslee.com
> > http://www.functionaldiversity.org
> 
> ______________________________________________
> R-help at 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.
> 


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