[R] provide extra variables to environment in call

Khamenia, Valery V.Khamenia at biovision-discovery.de
Fri Oct 8 15:33:57 CEST 2004

Hi all,


 there is a function `f' already defined by someone and 
 provided in package. `f' looks like that:

  f <- function() {

 i.e. `f' is not closed i.r.t. term `x'

 now I have my own function `g', where I'd like
 to override variable `x' while calling `f':

  x <- "dummy gloabal value"

  g <- function() {
    x <- 42
    eval(f(), environment()) # how to make loacl `x' visible in `f'?

  g() # => Error in x + 1 : non-numeric argument to binary operator

Here comes the question:

 What is the right way to call `f' in order to override 
 global value of `x' with the local value defined within 
 of function `g' ?

I see that i've missed something in docs for eval/environments and related.

Thank you in advance.

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