[R] Where to find source of C_pbinom?

[Marius Hofert]

Dear Ranjan,

thanks, that was what I was looking for. Somehow my 'grep' must have
missed that.

Cheers,

Marius


On Wed, Aug 27, 2014 at 8:34 AM, 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