Hello list,
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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D??partement des Sciences Biologiques
Universit?? de Montr??al, C.P. 6128, succursale centre-ville
Montr??al, Qu??bec H3C 3J7, Canada
Tel : (514) 343-6111 poste 1233 Fax : (514) 343-2293
E-mail : stephane.dray at umontreal.ca
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