Creating a function in R with variable number of arguments,

Question

When creating a function in R, we usually specify the number of argument like

function(x,y){
}

That means it takes only two arguments. But

Answer 1

You can use ... to specify an additional number of arguments. For example:

myfun <- function(x, ...) {
    for(i in list(...)) {
        print(x * i)
    }
}

> myfun(4, 3, 1)
[1] 12
[1] 4
> myfun(4, 9, 1, 0, 12)
[1] 36
[1] 4
[1] 0
[1] 48
> myfun(4)