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 levels(x). For the default method, NULL or a character vector.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth \& Brooks/Cole.

See Also

levels<-.factor, nlevels.

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