[R] Arguments of R- and C-side of internal functions
Timur.Elzhov at jinr.ru
Fri Jan 17 16:11:03 CET 2003
Dear R experts,
I looked at the body of, say, `optim' function and found
the call to the `.Internal', C optim function. It looks
.Internal(optim(par, fn1, gr1, method, con, lower, upper))
On the other hand, the C prototype of optim is:
SEXP do_optim(SEXP call, SEXP op, SEXP args, SEXP rho);
So, I guess that all the list of parameters passing in R are assigned
to `args', right?
First, how is that implemented? I looked at the `.Call()' - as I
understand, it requires for C-side the same number of parametrs
(minus the function name to be called); and `.External()' - it
wants the single list.
Second, who pass the other, `call', `op' and `rho' parameters
to `do_optim() ?'
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