[R] accessing function arguments as text, macro style

[Berton Gunter]

This solution may not quite work as you intend. I believe that the preferred
solution is:
 f <- function(x) paste(deparse(substitute(x)),x)

This would give the same result with the z<-3 example below, but try it for both
versions with the call:
f(sin(3))

The subtlety is that substitute returns the parse TREE of its
(expression)argument, which you probably want deparsed rather than cast by
as.character().

Cheers,
Bert

Ed L Cashin wrote:

> Gabor Grothendieck <ggrothendieck at myway.com> writes:
>
> ...
> > R> f <- function(x) paste(as.character(substitute(x)),x)
> > R> z <- 3
> > R> f(z)
> > [1] "z 3"
>
> Fantastic.  Works like a charm.
>
> --
> --Ed L Cashin            |   PGP public key:
>   ecashin at uga.edu        |   http://noserose.net/e/pgp/
>
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--

Bert Gunter

Non-Clinical Biostatistics
Genentech
MS: 240B
Phone: 650-467-7374


"The business of the statistician is to catalyze the scientific learning
process."

 -- George E.P. Box