questionr (version 0.7.4)

duplicated2: Determine all duplicate elements

Description

The native duplicated function determines which elements of a vector or data frame are duplicates of elements already observed in the vector or the data frame provided. Therefore, only the second occurence (or third or nth) of an element is considered as a duplicate. duplicated2 is similar but will also mark the first occurence as a duplicate (see examples).

Usage

duplicated2(x)

Arguments

x

a vector, a data frame or a matrix

Value

A logical vector indicated wich elements are duplicated in x.

See Also

duplicated

Examples

# NOT RUN {
df <- data.frame(x=c("a","b","c","b","d","c"),y=c(1,2,3,2,4,3))
df
duplicated(df)
duplicated2(df)
# }

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