[R] Re ading Functions that are in a Vector

Rolf Turner r.turner at auckland.ac.nz
Mon Sep 28 05:07:35 CEST 2009


On 28/09/2009, at 3:36 PM, trumpetsaz wrote:

>
> I am trying to write a function that will have an input of a vector of
> functions. Here is a simplistic example.
> sumstats <- c(mean,sd)
> sumstats[1]
> #Gives this error
> #> sumstats[1]
> #[[1]]
> #function (x, ...)
> #UseMethod("mean")
> #<environment: namespace:base>
>
> I thought about restricting the input to character variables such  
> as the
> following
> sumstats2 <- c("mean","sd")
> Is there a way to change "mean" to the function mean?

You *can't* have a vector of functions, as far I know.  The entries
of a vector must be (numeric, character, or logical) scalars.

You *can* have a *list* of functions; this might be the way you
want to go.

To ``change "mean" to the function mean'' --- set ?get.

	cheers,

		Rolf Turner

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