ZT2008 wrote:
>
> ... can be used to represent unknown number of parameters passed into a
> function.
>
> For example, I write a function g. g calls another function f1.
>
> For example f1 could be different random number generation function.
>
> when f1=rnorm(), it has 3 parameters n, mean and standard deviation.
>
> when f1=rexp(), it has 2 parameters n and rate.
>
> g can be defined as
>
> g <- function(f1, ...) {
> f1(...)
> }
>
> My problem is what about g calls two functions with unknown number of
> parameters.
>
> In this case one ... doesn't help.
>
> If I define g as follows:
>
> g <- function(f1, f2, ...) {
> f1(...)+f2(...)
> }
>
> It seems ... is only passed to f1, it can't be passed to f2.
No, it is passed to both:
g <- function(f1, f2, ...) {
f1(...) + f2(...)
}
f1 <- function(a) print(a)
f2 <- function(a) print(a)
g(f1, f2, 5)
[1] 5
[1] 5
[1] 10
> Can anybody help me? Thanks!
Well, what you requested already works...
If you want to pass different arguments to f1 and f2, you might want to
specify two *lists* of arguments for f1() and f2() in g() and call f1()
and f2() by do.call() within g().
Uwe Ligges
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