[R] Levels number of a factor object

[Spencer Graves]

 > groups<-gl(4,10)
 > levels(groups)
[1] "1" "2" "3" "4"
 > length(levels(groups))
[1] 4

      Is this what you want? 
      spencer graves

Laurent Houdusse wrote:

>Hi all!
>
>    How to retrieve the levels number of a factor object?
>    See this code:
>    groups<-gl(4,10)
>    I want to retrieve the number of levels (4) of my object "groups"
>    I tried groups.levels but this don't work
>
>    Thanks
>
>
>Laurent Houdusse 
>Analyste Programmeur
>
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