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

If the argument is not a factor, NA is returned.

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

Examples

nlevels(gl(3,7)) # = 3

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