[R] Return value from function with For loop

[Ramnik Bansal]

In the code below


*ff <- function(n){ for(i in 1:n) (i+1)}*

*n<-3;ff(n)->op;print(op)*

Why doesnt *print(op) * print 4 and instead prints NULL.
Isnt the last line of code executed is *i+1 * and therefore that should be
returned instead of NULL

instead if I say
*ff <- function(n){ (n+1) }*

Then
*n<-3;ff(n)->op;rm(n);print(op)*
gives 4 as output.

My question is *Which *is considered as the last line in a functoin for the
purpsoe of default return ? And under what conditions ?

-Thanks,
Ramnik

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