[R] Applying multiple functions to one object

[jctoll]

On Wed, Feb 2, 2011 at 7:59 AM, Karl Ove Hufthammer <karl at huftis.org> wrote:
> Dear list members,
>
> I recall seeing a convenience function for applying multiple functions to
> one object (i.e., almost the opposite of 'mapply’) somewhere.
> Example: If the function was named ’fun’ the output of
>
>  fun(3.14, mode, typeof, class)
>
> would be identical to the output of
>
>  c(mode(3.14), typeof(3.14), class(3.14))
>
> Is my memory failing me, or does such a function already exists in a
> package? Of course, it’s not difficult to define a summary function and
> apply this to the object, but writing, for example,
>
> fun(x, mean, median, sd, mad)
>
> to quickly show the relevant information is much more *convient*.
>
>
> It would be even nicer with a function that could also handle vectors and
> lists of values, and output the result as data frames or matrices. Example:
>
> x = c("foo", "bar", "foobar")
> fun(x, nchar, function(st) substr(st, 1 ,2) )
>
> y = list(3, 3L, 3.14, factor(3))
> fun(x, mode, typeof, class)
>
> --
> Karl Ove Hufthammer
>
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> and provide commented, minimal, self-contained, reproducible code.
>

Karl,

Perhaps you're thinking of the Reduce function? There's an example
from the help page that you might be able to adapt to your purpose.

## Iterative function application:
Funcall <- function(f, ...) f(...)
## Compute log(exp(acos(cos(0))
Reduce(Funcall, list(log, exp, acos, cos), 0, right = TRUE)

HTH,

James