[R] How to define mutualy exclusive parameters of a function

[Eric Berger]

Hi Pol,
Here is one way:

fb <- function(mean=NULL, median=NULL, mode=NULL, a, b=0.95, lower=F) {

    stopifnot ( (is.null(mean) + is.null(median) + is.null(mode)) == 2 )

    etc...

}


HTH,
Eric


On Thu, Apr 26, 2018 at 4:46 PM, Polychronis Kostoulas <
polychronis.kostoulas using gmail.com> wrote:

> Dear All,
> apologies if this is basic: I am writing a function:
>
> fb<-function(mean, median, mode, a, b=0.95, lower=F)
> {....}
>
> The arguments mean, median and mode are mutually exclusive (i.e. the user
> should define only one of these). How do I code this within the function?
>
> Thanks,
> Pol
>
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