levels                 package:base                 R Documentation

Levels Attributes

Description:

     `levels' provides access to the levels attribute of a variable.
     The first form returns the value of the levels of its argument and
     the second sets the attribute.

     The assignment form (`"levels<-"') of `levels' is a generic
     function and new methods can be written for it. The most important
     method is that for `factor's:

Usage:

     levels(x)
     levels(x) <- value

Arguments:

       x: an object, for example a factor.

See Also:

     `levels<-.factor', `nlevels'.

