nlevels {base} R Documentation

The Number of Levels of a Factor

Description

Return the number of levels which its argument has.

Usage

nlevels(x)


Arguments

 x an object, usually a factor.

Details

This is usually applied to a factor, but other objects can have levels.

The actual factor levels (if they exist) can be obtained with the levels function.

Value

The length of levels(x), which is zero if x has no levels.

levels, factor.
nlevels(gl(3, 7)) # = 3