[R] Levels number of a factor object

Thomas Petzoldt thpe at hhbio.wasser.tu-dresden.de
Fri Jan 23 16:05:34 CET 2004

Laurent Houdusse schrieb:

> 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

Simply try:


Thomas P.

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