[R] environment

[Peter Dalgaard]

Romain Francois <francoisromain at free.fr> writes:

> Hi,
> 
> Consider the code :
> 
> g <- function(){
>   print(.x)
>  .x <- 3
> }
> 
> f <- function(){
>   environment(g) <- environment()
>   .x <- 2
>   g()
>   .x
> }
> 
>  > f()
> [1] 2
> [1] 2
> 
> 
> I would like f() to return 3. How can I do that ? Am I completely out of 
> place ?
> Doing that, I want to avoid to pass .x as a parameter in f, because in 
> real life .x is pretty big and g() is called over and over in a loop.

If you want to assign into the environment of g, you'll need <<- ,
otherwise you  assign to a local variable. 

Another possibility involves assign(..., parent.frame()) 

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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