Alldups function

Finds all duplicates

Finds duplicates from both ends, optionally returns indexes of duplicate groups

Alldups(v, groups=FALSE)

Arguments

• v: Vector, matrix or data frame
• groups: If TRUE, returns group indexes (non-duplicated are 0)

Details

This is extension of duplicated() which does not skip the first duplicate in each group. 'NA' consider for duplicates but do not count as duplicate group.

If the first argument is a matrix or data frame and 'groups=TRUE', Aldups() starts from converting them into character vector with paste0(..., collapse="").

If 'groups=TRUE', Alldups() uses as.numeric(as.character(v)) twice to index duplicated groups with natural numbers (and non-duplicated with 0).

Returns

Logical vector of length equal to 'v', or numerical vector if 'groups=TRUE'

Author(s)

Alexey Shipunov

See Also

duplicated

Examples

aa <- c("one", "two", "", NA, "two", "three", "three", "three", NA, "", "four")
Alldups(aa)
data.frame(v=aa, dups=Alldups(aa), groups=Alldups(aa, groups=TRUE))

## clustering based on duplicates from rounding
(iris.dgr <- Alldups(round(iris[, 1:4]/10), groups=TRUE))
Misclass(iris.dgr, iris$Species, best=TRUE)