Don't provide a default value for c in the parameter list. Then you can use
the missing() function to make decisions, including whether to generate a
default value for c or not.
--
Sent from my phone. Please excuse my brevity.
On March 24, 2016 5:11:43 AM PDT, sbihorel <sebastien.biho...@cognigencorp.com>
wrote:
>Hi,
>
>Please consider the following functions:
>
>myf1 <- function(x,fun){
> if (is.null(fun)){
> x
> } else {
> do.call(fun, list(x))
> }
>}
>
>myf2 <- function(a=1, b=2, fun=NULL, c=myfun1(b,fun)){
>
> if (myf1(b,fun)>0 & <c was not provided in function call>){
> c <- b
> }
> print(list(a,b,c))
>}
>
>myf2(a=2,b=3,fun=exp)
>myf2(a=2,b=3,fun=exp,c=4)
>
>I need to replace "<c was not provided in function call>" by some code
>that would make myf2 aware of it own calls and of the fact that the c
>argument was provided or not in the function calls.
>
>Thanks for your help
>
>Sebastien
>
>______________________________________________
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>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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______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
