It seems that R (unlike S-plus) allows assignments to elements of a
vector objects even when the object do not exists locally (inside a
fucntion) in cases where an object of the same name exists globally. I
guess this is not really desired behaviour:
R v1.8.0
> a
Error: Object "a" not found
> testfunc <- function() {a[1]<-1; a}
> testfunc()
Error in testfunc() : Object "a" not found
> a<-2
> testfunc()
[1] 1
> a
[1] 2
S-plus v6.0
> a
Problem: Object "a" not found
> testfunc <- function() {a[1]<-1; a}
> testfunc()
Problem in testfunc(): Object "a" not found
Use traceback() to see the call stack
> a <- 2
> testfunc()
Problem in testfunc(): object "a" must be assigned locally before
replacement
Use traceback() to see the call stack
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