nlme (version 3.1-1)

pruneLevels: Prune Factor Levels

Description

The levels attribute of object are pruned to contain only the levels occurring in the factor.

Usage

pruneLevels(object)

Arguments

object

an object inheriting from class factor.

Value

• an object identical to object, but with the levels attribute containing only value occurring in the factor.

See Also

factor, ordered

Examples

f1 <- factor(c(1,1,2,3,3,4,5))
levels(f1)
f2 <- f1[4:7]
levels(f2)
levels(pruneLevels(f2))