[R] Evaluating f(x(2,3)) on a function f<- function(a,b){a+b}

Gabor Grothendieck ggrothendieck at gmail.com
Wed Aug 22 16:19:45 CEST 2007

Try this:

do.call(f, as.list(x))

On 8/22/07, Søren Højsgaard <Soren.Hojsgaard at agrsci.dk> wrote:
> Dear list
> I have a function and a vector, say
>    f <- function(a,b){a+b}
>    x <- c(2,3)
> I want to "evaluate f on x" in the sense of computing f(x[1],x[2]). I would like it to be so that I can write f(x). (I know I can write a wrapper function g <- function(x){f(x[1],x[2])}, but this is not really what I am looking for). Is there a general way doing this (programmatically)? (E.g. by "unpacking" the elements of x and putting them in the "right places" when calling f...)
> I've looked under formals, alist etc. but so far without luck.
> Regards
> Søren
>        [[alternative HTML version deleted]]
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