[R] Passing additional arguments through '...'

Bert Gunter gunter.berton at gene.com
Wed Jul 15 18:25:23 CEST 2009


Please consult the R Language Definition for a detailed explantion, but...

In brief, the evaluator first tries to match formal arguments by name, first
exactly, then partially, before matching by position, so "a" partially
matches formal argument "abc".

e.g. contrast 
> fun.tester(0,b=1) ## "b" does not partially match "abc"
[1] 0

Bert Gunter
Genentech Nonclinical Biostatistics

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of escher2079
Sent: Wednesday, July 15, 2009 9:06 AM
To: r-help at r-project.org
Subject: [R] Passing additional arguments through '...'


Hi,

I know this is a simple question, but I've been having problems passing
additional arguments through '...'. It is not matching the arguments
correctly if the permanent argument of the function begins with the same
letter as the additional argument. The following example will help show what
I mean:

fun.tester <- function(abc,...){
+ print(abc)
+ }

But if I input:
fun.tester(0,a=1)

It returns the value '1' for abc. It does however, work properly if I input:
fun.tester(abc=0,a=1)

It seems like a simple problem, so I would assume I'm doing something
stupid, but I haven't been able to find a solution anywhere. Thanks!
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