[R] levels() function for a vector

From: Chang Liu <changisme_at_hotmail.com>
Date: Mon, 10 Mar 2008 18:02:27 -0700


I'm trying to use levels function, but I don't know why it's returning NULL. For example:  

> temp[1] 3 5 5 NA> levels(temp)NULL>

Also, I've tried:
> list(temp)[[1]][1] "3" "5" "5" NA
> levels(list(temp))NULL

Is there a specific requirement on the parameter?  


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