[R] Beginner in R

[Norbert Billet]

hello ( and sorry for my poor english ... )

I'm a newbie on R software and I need to obtain this kind of system :

a structure, like a liste :

my_struct <- list()
my_struct$a <- a_value
my_struct$b <- another_value
my_struct$c <- one_more_value

and a function with two args : the first is a instance of the structure, 
and the second is any component of the structure (here $a, $b or $c) and 
the function will do some transformations on this component :

my_func <- function(a_struct, a_comp)
{
    a_comp <- transformationFunct(a_comp)
   
    a_result <- someComputation(a_struct)

    return(a_result)      
}

In reallity, the structure have lot of components (+/- 40) who are input 
parameters for a time discret model and this function is to do selective 
sensitivity analysis.

Thanks in advance for this information and thanks for doing a open high 
quality software.

Norbert