On Tue, May 19, 2009 at 4:22 PM, Kynn Jones <kyn...@gmail.com> wrote:
> 2. I have a package in which most of the functions have the form:
>
> the.function <- function(some, list, of, params) {
> return( some.other.function(the.list.of.params.to.this.function));
> }
>
> Is there a way that I can use a loop to define all these functions?
How about something like this:
funnames <- c('f1', 'f2', 'f3')
funfactory <- function(n) {
f <- function(...) NULL
body(f) <- substitute(REPLACE(...), list(REPLACE=as.name(n)))
f
}
funlist <- lapply(funnames, funfactory)
"funlist" is a list of function objects that wrap calls to the
named functions.
> In general, I'm looking for all the information I can find on the subject of
> dynamic function definition (i.e. using code to automate the definition of
> functions at runtime). I'm most interested in introspection facilities and
> dynamic code generation. E.g. is it possible to write a module that
> "redefines itself" when sourced? Or can a function redefine itself when
> first run? Or how can a function find out about how it was called?
You should read chapter 6 of the "R Language Definition" manual, which is
titled "Computing on the language".
--
Steve Weston
REvolution Computing
One Century Tower | 265 Church Street, Suite 1006
New Haven, CT 06510
P: 203-777-7442 x266 | www.revolution-computing.com
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