[R] Local Scopes in S

[Thomas Lumley]

On Fri, 20 Oct 2000, Jorge Luis Ojeda Cabrera wrote:

> 
> I 've been working with R since last year and I am quite "happy" with R 
> capabilities. Nevertheless, I need to present my job to other people 
> (S-users) and I am facing a problem with R & S compatibility: my 
> R-scripts make intensive use of functions local scope, and as far as I 
> know(I am a new to S) S does not have this capability.
> 
> I use to  do things like:
> 
> create.f <- function(data)
> {
> 	f <- function(x) { return( sum(data-x) );}
> 	return( f )
> }
> 
> d <- 1:10
> g <- create.f(d)
> d <- NULL
> g(1)
> [1] 45
> 
> Does exist an easy way to solve the problem ?
> May be I've missed some easier implementation in R..?

This sort of R function can be ported to S using the MC() (make
closure) function by Luke Tierney that appears in the FAQ (section 3.3.1).

	-thomas

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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