| levels {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 factors:
Usage
levels(x)
levels(x) <- value
Arguments
x |
an object, for example a factor. |
value |
A valid value for |
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth \& Brooks/Cole.
See Also
levels<-.factor, nlevels.