Count Unique Non-Missing Values

Returns the number of unique values in a vector, excluding missing values (NA).

Usage

count_unique(x)

Arguments

x

A vector of any type (numeric, character, factor, etc.)

Value

An integer representing the count of unique non-missing values in `x`.

Examples

# Basic usage
count_unique(c(1, 2, 2, 3, 3, 3))
#> [1] 3

# With missing values
count_unique(c(1, 2, NA, 2, 3, NA))
#> [1] 3

# With character vector
count_unique(c("a", "b", "a", "c"))
#> [1] 3

# Empty vector
count_unique(c())
#> [1] 0

# All NA values
count_unique(c(NA, NA, NA))
#> [1] 0