[R] creating a closed loop for a list

[djrwicks]

Given the following, how to I get x[i+1] to not return an NA result when it
gets to the end of list x by looping back to the start of the list
i.e should return: 0 0 2 2 2 2?

> x<-c(2,0,0,2,2,2)
> i<-1:length(x)
> x[i]
[1] 2 0 0 2 2 2
> x[i+1]
[1]  0  0  2  2  2 NA
 
can i be described using a loop that says go back to the beginning of list
x?

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