I have a question concerning argument matching I have read R Language Definition before).
I have a function multxby2 which takes as argument the call to another function f1.
I would like to take the values of xx from the call to f1 and use it in multxby2.
Here is an example:
multxby2 <- function(callf) { appel1<-match.call() appel<-as.list(as.call(appel1$callf))
px<-pmatch(names(appel),"xx")
if(sum(is.na(px))!=length(appel)) print(appel[[which(!is.na(px))]]*2)
# else ...}
f1=function(xx=2,y=3){}multxby2(f1(x=3))
My problem is due to the various ways that a user can enter its arguments, how to be sure to get xx from various call such as:
multxby2(f1(3,2)) multxby2(f1(y=2,3))
Is there a way to do that avoiding a lot of "if" and how to solve the last case ? My practical case takes functions with around 20 arguments.
Thanks in advance,
Sincerely.
St�phane DRAY
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