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Finding All Duplicates in Vector

Source: R/utils.R
h_all_duplicated.Rd

The difference here to duplicated() is that also the first occurrence of a duplicate is flagged as TRUE.

Usage 

h_all_duplicated(x)

Arguments

x

a vector or a data frame or an array or NULL.

Value

Logical vector flagging all occurrences of duplicate values as TRUE.

Examples 

h_all_duplicated(c("a", "a", "b"))
#> [1]  TRUE  TRUE FALSE
duplicated(c("a", "a", "b"))
#> [1] FALSE  TRUE FALSE