[R] do.call and environments

[Thomas Petzoldt]

Hello,

I want to call a function "fx" given by name, where some "global" 
variables (in the environment of fx) are passed to the function. For 
compatibility reasons I cannot modify the parameter list of fx and I 
want to avoid setting variables in the global environment (e.g. via <<-)

Is there a way, how to do this?

Thomas P.

The example:

fx <- function(y) print(x*y)

f <- function(fun, xx) {
   fxx <- function() {do.call(fun, list(y=3))}
   x <- x
   fxx()
}

f("fx", 13)

## does not work, because fx does not find x