vec_duplicate {vctrs}R Documentation

Find duplicated values

Description

Usage

vec_duplicate_any(x)

vec_duplicate_detect(x)

vec_duplicate_id(x)

Arguments

x

A vector (including a data frame).

Value

Missing values

In most cases, missing values are not considered to be equal, i.e. NA == NA is not TRUE. This behaviour would be unappealing here, so these functions consider all NAs to be equal. (Similarly, all NaN are also considered to be equal.)

Dependencies

See Also

vec_unique() for functions that work with the dual of duplicated values: unique values.

Examples

vec_duplicate_any(1:10)
vec_duplicate_any(c(1, 1:10))

x <- c(10, 10, 20, 30, 30, 40)
vec_duplicate_detect(x)
# Note that `duplicated()` doesn't consider the first instance to
# be a duplicate
duplicated(x)

# Identify elements of a vector by the location of the first element that
# they're equal to:
vec_duplicate_id(x)
# Location of the unique values:
vec_unique_loc(x)
# Equivalent to `duplicated()`:
vec_duplicate_id(x) == seq_along(x)

[Package vctrs version 0.6.5 Index]