Note that
rm(i)
for(j in 1:4) F(j)
raises an error due to scoping issues.
On Sun, Jan 18, 2009 at 10:02 PM, <markle...@verizon.net> wrote:
> I've been going back to old difficult R-list "evaluation" emails that I save
> in order to understand evaluation better and below still confuses me. Could
> someone explain why A) works and B) doesn't. A variant of below is in the
> Pat's Inferno book also but I'm still not clear on what is happening.
> Thanks.
>
> f <- function() {
> # FORCING i here doesn't help
> i*i
> }
>
> F <- function(i) {
> force(i)
> print(f())
> }
>
> A) THIS WORKS
> for ( i in 1:4 ) {
> F(i)
> }
>
> B) THIS DOESN'T
> lapply(1:4,function(i) F(i))
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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