length of `...`
This question is better aimed at the r-help mailinglist as it is not about
developing R itself.
having said that,
I can only gues why you want to do this, but why not do something like this:
f <- function(...){
L <- list(...)
len <- length()
# you can stll pass the ... as follows:
do.call(someotherfunction, L)
}
-Mark
Op do 3 mei 2018 om 16:29 schreef D?nes T?th <toth.denes at kogentum.hu>:
Hi, In some cases the number of arguments passed as ... must be determined inside a function, without evaluating the arguments themselves. I use the following construct: dotlength <- function(...) length(substitute(expression(...))) - 1L # Usage (returns 3): dotlength(1, 4, something = undefined) How can I define a method for length() which could be called directly on `...`? Or is it an intention to extend the base length() function to accept ellipses? Regards, Denes
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