On Mon, Mar 31, 2014 at 11:08 AM, Tierney, Luke <luke-tier...@uiowa.edu> wrote:
> The environment in which default arguments are evaluated is the
> environment of the function call itself, not the environment of the
> caller or the lexical enclosure (the same here). So the two 'y' used
> in function(y = y) refer to the same binding, hence circular
> reference. If you use
>
> foo <- function (z = 2) {
> bar <- function (y = z) y^2
> bar()
> }
>
If it were important to keep the same variable name, y, in both places
then this would be a way to avoid the recursive reference:
foo <- function (y = 2) {
bar <- function (y = parent.frame()$y) y^2
bar()
}
foo()
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