[R] Using if statement on function

[Etienne Stockhausen]

Hello everybody,

I'm trying to use a if-statment on a function. For a better 
understanding I want to present a small example:

    FUN=mean                             # could also be median,sd or 
any other function
    if (FUN == mean)
       plot(...)
    if (FUN == median)
       plot(...) 
    ...

This doesn't work, because FUN is a function. I've already tried to 
coerce the type of  FUN with as.character( ), but that's also not 
possible. I'm stuck with this task and it is absolutely necessary to 
give FUN  the class of a function.
I'm looking forward for any hints, clues or solutions for my problem.

So much thanks in advance

Etienne