[R] Detect the presence of an object

Marc Schwartz MSchwartz at medanalytics.com
Fri Jan 30 22:42:19 CET 2004

On Fri, 2004-01-30 at 14:58, Francisco J Molina wrote:
> Is there a  function like "is.there" such that 
> is.there ( a ) returns TRUE is object 'a' is in the current environment and
> FALSE otherwise?
> Thank you.
> Francisco J. Molina

See ?exists

This requires that the object of interest is quoted:

> a <- "I am here"
> exists(a)
> exists("a")
[1] TRUE

There are other arguments to the function to indicate where to search,


Marc Schwartz

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