> Are you aware of any function what would query the original function call
> arguments no matter what happens in the function?
Use missing() first.
If you can't use missing() first, or use it early in a parent function and pass
a flag, you could perhaps pass a copy of the parent function call to the
daughter function and see if an argument was included in the call. Example:
f1 <- function(x, ...) {
if(missing(x)) x<-3
f2(x, match.call())
}
f2 <- function(x, f1.call) {
testx <- if(is.null(f1.call$x)) "x was absent in f1" else "x specified
in f1"
xval <- paste("x now set to", x)
cat(sprintf("%s\n%s\n",testx, xval))
}
f1()
f1(x=2)
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