Hi. I'm having trouble testing for existence of an object inside a function.
Suppose I have a function: f<-function(x){ ... } and I call it with argument y: f(y) I'd like to check inside the function whether argument y exists. Is this possible, or do I have to either check outside the function or pass the name of the argument as a separate argument? If I do exists(x) or exists(eval(x)) inside the function and y does not exist, it generates an error message. If I do exists("x") it says that x exists even if y does not. If I had a separate argument to hold the text string "y" then I could check that. But is it possible to check the existence of the argument inside the function without passing its name as a separate argument? Thanks! -- TMK -- 212-460-5430 home 917-656-5351 cell ______________________________________________ R-help@stat.math.ethz.ch mailing list 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.