Thanks for clarifying.
Is my (new) understanding stated below correct? - A closure is any function (user- or system- defined) where is.primitive(functionName) is FALSE. - is.primitive(functionName) is FALSE when functionName is a system-defined function that is coded in R itself. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org 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.