[R] How to test if t[[cat]] exists ?

Hi, t - list(cat=1) exists(t) [1] TRUE exists(t[[cat]]) Error: unexpected symbol in exists(t[[cat exists(t[[\cat\]]) [1] FALSE Thanks Stanley [[alternative HTML version deleted]] __ R-help@r-project.org mailing list

Re: [R] How to test if t[[cat]] exists ?

On Apr 15, 2008, at 9:53 PM, Ng Stanley wrote: Hi, t - list(cat=1) exists(t) [1] TRUE exists(t[[cat]]) Error: unexpected symbol in exists(t[[cat exists(t[[\cat\]]) [1] FALSE Perhaps what you want is: cat %in% names(t) Thanks Stanley Haris Skiadas Department of Mathematics and