The R Language manual, section 4.3.4 ("Scope"), has
f <- function(x) {
y <- 10
g <- function(x) x + y
return(g)
}
h <- f()
h(3)
... When `h(3)' is evaluated we see that its body is that of `g'.
Within that body `x' and `y' are unbound.
Is that last sentence right? It looks to me as if x is a bound
variable, and the definitions given in the elided material seem to say
so too. I guess there is hidden, outer, x that is unbound. Maybe the
example was meant to be
g <- function(a) a + y?
The front page of the manual says
The current version of this document is 2.4.0 (2006-11-25) DRAFT.
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Ross Boylan wk: (415) 514-8146
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