[R] Existence of an object
Rainer Schuermann
rainer.schuermann at gmx.net
Sat Nov 7 06:25:36 CET 2015
For me,
"meanedf" %in% ls()
works:
meanedf <- 1
"meanedf" %in% ls()
[1] TRUE
rm( meanedf )
"meanedf" %in% ls()
[1] FALSE
Rgds,
Rainer
On Saturday 07 November 2015 04:48:04 Margaret Donald wrote:
> I have a variable meanedf which may sometimes not be defined due to a
> complex set of circumstances.
> I would like to be able to find out whether or not it exists, and then
> branch appropriately in my code.
>
> I had hoped to be able to use is.null() or exists() but neither of these
> returns TRUE or FALSE which is the behaviour I would like, so that I can
> write some appropriate branching code.
>
> is.null(meanedf)
> Error: object 'meanedf' not found
> No suitable frames for recover()
>
> exists(meanedf)
> Error in exists(meanedf) : object 'meanedf' not found
>
> I would like some code which returns TRUE when meanedf exists and FALSE
> when it doesn't.
>
> Thanks, and regards,
> Margaret Donald
>
>
>
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