Marius Hofert wrote:
Dear expeRts,
I would like to call a function f from a function g with or without an argument.
I use missing() to check if the argument is given. If it is not given, can I set
it to anything such that the following function call (to f) behaves as if the argument
isn't given? It's probably best described by a minimal example (see below).
The reason why I want to do this is, that I do not have to distinguish between
the
cases when the argument is given or not. By setting it to something (what?) in
the
latter case, I can use the same code in the subsequent part of the function.
Cheers,
Marius
f <- function(x) if(missing(x)) print("f: missing x") else print(x)
g <- function(x){
if(missing(x)){
print("g: missing x")
x <- NULL # I try to set it to something here such that...
Just leave out the line above, and you'll get both messages printed:
> g()
[1] "g: missing x"
[1] "f: missing x"
Duncan Murdoch
}
f(x) # ... this call to f behaves like f()
}
g() # should print "f: missing x" (is this possible?)
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and provide commented, minimal, self-contained, reproducible code.
