[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,
Situation:
there is a function `f' already defined by someone and
provided in package. `f' looks like that:
f <- function() {
x+1
}
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.
--
Valery.
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