Le 14/10/13 19:33, Mark Fredrickson a écrit :
Hello,
Does anyone have an example of calling into C level functions that would
be called with .Internal() in R?
Specifically, I'd like to call do_rank, as defined in:
http://svn.r-project.org/R/trunk/src/main/sort.c
These functions have an unusual signature, and I'm not sure what
headers/linker directives I would need to include to get access to this
function.
I am aware that I could call the R level rank() function, but I'm trying
to avoid the performance penalty.
Thanks,
-Mark
Most of them are hidden. You can't call them. For example:
SEXP attribute_hidden do_rank(SEXP call, SEXP op, SEXP args, SEXP rho)
The attribute_hidden hides the function. If you want this function to be
available as part of the R api, you need to negociate that with the R
core team.
In similar situations, people have copied the code over to their
project. It might be appropriate for you.
Romain
--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
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