[R] How to use a string to refer a function?

[Don MacQueen]

Don't really understand what you have in mind, but maybe this will do it.

f <- function(x=3) x^2

Now, if I want to "get" the function f, given that I only know its 
name "f", I can do this:

getf <- get('f')

getf(4)

Or even:

>  get('f')(5)
[1] 25

Also,

>  attributes(getf)
$source
[1] "function(x=3) x^2"

At 4:26 PM -0600 2/11/10, blue sky wrote:
>  > f=function(){ print('in f')}
>>  attr(f, 'source')
>[1] "function(){ print('in f')}"
>
>I have the above simple function. I can use the variable f to refer to
>the function and get the function source.
>
>Suppose that I have 'f' as a string (say I get it from ls()), could
>somebody let me know how to get the function from the name 'f'?
>
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062