Identify columns with a specific number of unique values

This function identifies columns in a data frame that have a specific number of unique values. It can be used to find constant, binary, ternary, or any other n-ary columns. If there are no identified columns, it will return NA.

Usage

cols_binary(data, na.rm = FALSE)

cols_ternary(data, na.rm = FALSE)

cols_multinary(data, na.rm = FALSE, n = 1)

Arguments

data

The data frame

na.rm

Logical, whether to remove NA values before counting unique values.

n

The specific number of unique values to look for.

Value

A character vector of column names that have exactly n unique values.

Examples

cols_binary(mtcars)
#> [1] "vs" "am"