[R] Changing global variables from functions

[jtouyz]

Hey all,
I'm relatively new to the R-environment. I'm having a bit of trouble with
encapsulation.
I have a globally declared variable that doesn't update it when I change it
in a function. For example when I run the following function 

>deckn<-NULL
>deck1<-1  #52 card deck
>deck<-function()
{
#Creating a standard deck
deck1<-c(1:52)
deckn<-deck1
    #Creating n decks
    for (i in 2:num_decks)
    {
    deckn<-c(deckn,52*i+deck1-1)
    }
}
>deckn
>NULL

it returns NULL for deckn instead of a vector of values. Is there an easy
fix to update deckn in the function so that it outputs a vector of values (
I don't wish the function to return a value just update the current one)? 

Thanks in advance,
Josh Elliott
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