[R] Existence of an object

[Margaret Donald]

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


-- 
Margaret Donald
Post Doctoral researcher
University of New South Wales
margaret.donald at unsw.edu.au
0405 834 550

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