>
setClass("person",representation(name="character",age="numeric",kids="list"))
[1] "person"
> bob <- new("person")
> length(b...@name)
[1] 0
> length(b...@age)
[1] 0
> length(b...@kids)
[1] 0
> is.na(b...@kids)
logical(0)
> is.na(b...@age)
logical(0)
> is.na(b...@name)
logical(0)
> b...@kids <- list("joe","sue")
> is.na(b...@kids)
[1] FALSE FALSE
> length(b...@kids)
[1] 2Ah, length(obj...@property) is what i was looking for. Thanks alot. -- View this message in context: http://r.789695.n4.nabble.com/test-to-see-if-a-s4-property-is-assigned-tp2541044p2543895.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ [email protected] 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.
