You could make your 'f' a generic function and define methods
for various types. E.g., using S3 generics, define
f <- function(a, b) UseMethod("f")
f.default <- function(a, b) 10 * a + b
f.data.frame <- function(df) f(df$a, df$b)
and use them as
> f(b=5:7, a=1:3)
[1] 15 26 37
> f(1:3, 5:7)
[1] 15 26 37
> d <- data.frame(b=5:7, a=1:3)
> f(d)
[1] 15 26 37
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf
> Of ivo welch
> Sent: Wednesday, January 09, 2013 1:00 PM
> To: David Winsemius
> Cc: r-help
> Subject: Re: [R] multiple versions of function
>
> mea culpa.
>
> f <- function(...) {
> ## parse out the arguments and then do something with them
> }
>
> ## all of these should result in the same actions
> f(2,3) ## interprets a to be first and b to be second
> f(a=2,b=3)
> f(b=3,a=2)
> f(data.frame(a=2,b=3))
> f(data.frame(b=3,a=1))
>
>
>
> On Tue, Jan 8, 2013 at 8:00 AM, David Winsemius <dwinsem...@comcast.net>
> wrote:
> >
> > On Jan 7, 2013, at 6:58 PM, ivo welch wrote:
> >
> >> hi david---can you give just a little more of an example? the
> >> function should work with call by order, call by name, and data frame
> >> whose columns are the names. /iaw
> >>
> >
> > It is I who should be expecting you to provide an example.
> >
> > -- David.
> >
>
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