[R-pkg-devel] Call internal R functions in C

Cai Li c||9 @end|ng |rom nc@u@edu
Mon Apr 26 04:30:08 CEST 2021

Thanks Duncan! I was advised not to export those functions in the namespace
and keep them as internals. In terms of this, could you advise what
specific changes should I make to the C code so that I can evaluate them in
a suitable environment? I tried something like
"PROTECT(func_R=lang2(install("Package:::R_function"), func_data))," but it
did not work. Sorry this may be too naive and thanks again.


On Sun, Apr 25, 2021 at 8:46 PM Duncan Murdoch <murdoch.duncan using gmail.com>

> On 25/04/2021 7:23 p.m., Cai Li wrote:
> > Hello All,
> >
> > I'm developing a package with C code. My question may be naive: I have
> > several internal R functions that need to be called by C, but I cannot
> get
> > it to work or find a solution. It can work if I export those internal
> > functions in namespace, but it fails if I just want to keep them as
> > internal functions without exporting them. I guess I need some flags to
> > indicate the "internal" R internal functions? Could you please share your
> > thoughts on how to fix this? Much appreciated in advance!
> >
> > //   set up call to R function "R_function"
> >      SEXP func_R;
> >      PROTECT(func_R=lang2(install("R_function"), func_data));
> >
> It all depends on the environment where you evaluate that expression,
> just as it would if it was R code.  You can't see internal package
> functions from the global environment, you need to evaluate them in the
> package namespace environment.
> Duncan Murdoch

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