I want a function to evaluate one argument
in the environment of a data.frame supplied
as another argument. "attach" works for
this, but "with" does not. Is there a way
to make "with" work? I'd rather not attach
the data.frame.
With the following two functions "eval.w.attach"
works but "eval.w.with" fails:
dat <- data.frame(a=1:2)
eval.w.attach <- function(x, dat){
attach(dat)
X <- x
detach()
X
}
eval.w.with <- function(x, dat){
with(dat, x)
}
eval.w.attach(a/2, dat) # returns c(.5, 1)
eval.w.with(a/2, dat) # Error ... 'a' not found
Thanks, Spencer Graves
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