internal manipulation of ...
On Dec 12, 2013, at 3:32 PM, Romain Fran?ois <romain at r-enthusiasts.com> wrote:
Hello, I?m looking for examples on how to manipulate the ... internally, e.g. in a .Call or .External function. I?m particularly interested in accessing the environment in which each contribution to ... can be evaluated.
Arguments in ... are evaluated *before* being passed down to .Call/.External so there is no ... by the time you enter the C code. AFAIR R doesn't allow you to get at the promises outside of internal code, so you either get the call or the values, but nothing in between. Cheers, Simon
So far, I?m using tricks involving passing down the sys.calls() and sys.frames() down to the C function. The documentation in http://cran.r-project.org/doc/manuals/R-ints.html#Dot_002ddot_002ddot-arguments did not help me a lot. Romain
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