Hi. When I extend "numeric" with S4 and create an instance, I get something that looks and acts like a numeric. When I extend "data.frame" and create an instance, I get a NULL 'core'. Why is this, and can it be fixed? setOldClass(), prototype=, and initialize() don't seem to help.
Thanks, Tim ---- setClass("numClass",representation("numeric",num="numeric")) nn <- new("numClass",2,num=1) nn nn+1 setClass("dfClass",representation("data.frame",num="numeric")) df <- new("dfClass",as.data.frame(BOD),num=1) df ______________________________________________ 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.