| levels {base} | R Documentation |
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:
levels(x)
levels(x) <- value
x |
an object, for example a factor. |
levels<-.factor, nlevels.