Ahh, thank you very much, precisely what I was looking for :-)))
Cheers,
Marius
On 2010-11-13, at 12:41 , Duncan Murdoch wrote:
> 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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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
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