dplyr (version 0.3)

n_distinct: Efficiently count the number of unique values in a vector.

Description

This is a faster and more concise equivalent of length(unique(x))

Usage

n_distinct(x)

Arguments

x
a vector of values

Examples

Run this code
x <- sample(1:10, 1e5, rep = TRUE)
length(unique(x))
n_distinct(x)

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