[R] Formal definitions of R-language.

[Richard A. O'Keefe]

Murad Nayal <mn216 at columbia.edu> wrote:
	recursion, as far as I know, is inefficient in
	S/R. which tend to discourage purely functional programming.
	
It's not so much that _recursion_ is slow, as that function calling
is slow (whether recursive or not).  A large part of the reason is
that the S function calling convention was designed to favour
human ease-of-use much more than ease of compilation.