On 5/5/2016 11:17 PM, Bert Gunter wrote:
... and it's exactly with.default's code !
Thanks for pointing that out. Unfortunately, it didn't work inside
another function. However, if I had looked at it, I might have been
able to thought to try it. Spencer
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Thu, May 5, 2016 at 7:38 PM, Spencer Graves
<spencer.gra...@effectivedefense.org> wrote:
Hi, David: That works. Thanks very much. Spencer Graves
On 5/5/2016 7:43 PM, David Winsemius wrote:
On May 5, 2016, at 5:12 PM, Spencer Graves
<spencer.gra...@effectivedefense.org> wrote:
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)
How about using eval( substitute( ...))?
eval.w.sub <- function(expr, datt){
eval( substitute(expr), env=datt)
}
eval.w.sub(a/2, dat)
#[1] 0.5 1.0
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