how to check if an attribute exists
On Wed, Feb 2, 2011 at 7:22 PM, Nick Matzke <matzke at berkeley.edu> wrote:
Oh wait, this basically does it:
if ("a" %in% attributes(z)$names)
+ print(TRUE) [1] TRUE (but there may be a better way)
If z is a list, you can test is.null(z$a) Peter