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

[Polychronis Kostoulas]

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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