take precisely one named argument

Fri, Dec 17, 2004 6:26 AM

"BXC (Bendix Carstensen)" <bxc at steno.dk> writes:

Or (variant of same)

f <- function(..., a, b) {
    if (nargs() != 1 || length(list(...)))
          stop("precisely one of a=x or b=y must be given")
    else
          if (missing(a)) 2*b else a
}

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

take precisely one named argument

Thread (2 messages)