R-helpers: I'm guessing this is an easy one for some of you, but I'm a bit stumped. Given some arbitrary function (doesn't matter what it does):
myfunction <- function(a,b,c) { return(a+b+c) } I want to test this function for the presence of the ellipses ("...") and, if they are missing, create a new function that has them: myfunction <- function(a,b,c,...) { return(a+b+c) } So, 1) how do I test for whether a function has an ellipses argument and, 2) how do I "append" the ellipses to the argument list if they do exist? Note that the test/modification should be done without invoking the function, e.g. I'm not asking how to test for this WITHIN the function, I'm asking how to test "myfunction" directly as an R object. Thanks! --j -- Jonathan A. Greenberg, PhD Assistant Professor Global Environmental Analysis and Remote Sensing (GEARS) Laboratory Department of Geography and Geographic Information Science University of Illinois at Urbana-Champaign 259 Computing Applications Building, MC-150 605 East Springfield Avenue Champaign, IL 61820-6371 Phone: 217-300-1924 http://www.geog.illinois.edu/~jgrn/ AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007 ______________________________________________ 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.