Argument validation within functions
G'day Johannes, On Tue, 06 Dec 2011 16:15:21 +0100
"Johannes Radinger" <JRadinger at gmx.at> wrote:
Thank you, i didn't know that the !operator is
also working for is.numeric etc.
Anyway I want to test if an argument is set in the
function call and if not a code is executed... So
far I tried:
f <-function(a,b){
if(!exists("b")) print("exists: b is not set")
if(is.null("b")) print("is.null : b is not set")
}
f(a=1,b=2)
f(a=1)
f(b=2)
I don't really know how to do it...e.g: for f(a=1) b is not set
so it also can't be NULL (thats why is.null is not working). I
just want to "test" if it is set with the function call not outside
the function or before etc.
?missing Cheers, Berwin ========================== Full address ============================ A/Prof Berwin A Turlach Tel.: +61 (8) 6488 3338 (secr) School of Maths and Stats (M019) +61 (8) 6488 3383 (self) The University of Western Australia FAX : +61 (8) 6488 1028 35 Stirling Highway Crawley WA 6009 e-mail: Berwin.Turlach at gmail.com Australia http://www.maths.uwa.edu.au/~berwin