TITLE(duplicated @@ Determine Duplicate Elements)
USAGE(
duplicated(x)
)
ALIAS(duplicated)
VALUE(
This function determines which elements of a vector are duplicates
of elements with smaller subscripts, and returns a
logical vector indicating which elements are duplicates.
)
SEEALSO(
LANG(LINK(unique)).
)
EXAMPLES(
x <- c(9:20, 1:5, 3:7, 0:8)
# extract unique elements
x[!duplicated(x)]
all(0:20  == sort(x[!duplicated(x)]))
)
