Quotation marks help also for exists(): exists( "meanedf" ) [1] TRUE
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 > > > ______________________________________________ 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.
