[R] Run function in BATCH mode?

[purmann@mi.fu-berlin.de]

Hi,

I am working on a shell script where i need to start a R function defined in a
script. I know how to run the script; with 
R CMD BATCH script 
which would be equal to 
source("script") in R. 
But how do I run a function(param) of that script in the BATCH mode? 
Thanks in advance.