Collecting all function arguments in R

Question

Naively, I thought that R's ... notation would collect all named arguments that appear after it so that they can be passed along. For example:

> a <- function(..., arg=TRUE) b(...)
> b <- function(arg=TRUE) print(arg)
> a(arg=FALSE)
[1] TRUE # I would want this to be FALSE

Since this clearly doesn't happen, is there some way to package up all of the arguments supplied to a function so that they get sent along?

Probably [related](http://stackoverflow.com/questions/5890576/usage-of-three-dots-or-dot-dot-dot-in-functions) — Tensibai, Feb 11 '16 at 16:07
I guess [this](http://stackoverflow.com/a/17244041/354979) helps — rhombidodecahedron, Feb 11 '16 at 16:09
"arg" is not part of argument "..." of `a` which is passed to `b`. Depending on your use case, you might find `match.call` useful. — alexis_laz, Feb 11 '16 at 16:38
Possible duplicate of [Get all Parameters as List](http://stackoverflow.com/questions/11885207/get-all-parameters-as-list) — A. Webb, Feb 11 '16 at 19:14

score 1 · Answer 1 · answered Feb 11 '16 at 16:17

1

You will need to pass arg:

a <- function(..., arg=TRUE) b(..., arg = arg)

answered Feb 11 '16 at 16:17

G. Grothendieck

1

And if I have 100 arguments? I need to retype all of them? – rhombidodecahedron Feb 11 '16 at 16:24
1

Well designed functions don't have 100 arguments. – G. Grothendieck Feb 11 '16 at 18:32

1 Answers1