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.gos...@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.hof...@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@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.