... and it's exactly with.default's code !
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
>>
>>
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
