duplicate {tuple} | R Documentation |
Finds values that occur exactly twice in a vector.
duplicate(x)
x |
A vector. |
Returns the duplicated values in the same order that they would be
returned in a call to orphan
. This fundamentally
differs from duplicated
, which returns
a logical vector that is TRUE
when it runs into any but
the first occurrence of a value (and is therefore dependent on
the direction of testing of the vector).
unique
for similar output, and
duplicated
for the underlying calculations
duplicate(c(NA, 1:3, 3, 4:6, 3, NA, 4))