# nlevels

0th

Percentile

##### The Number of Levels of a Factor

Return the number of levels which its argument has.

Keywords
category
##### 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.
library(base) # NOT RUN { nlevels(gl(3, 7)) # = 3 # }