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tiepos
returns the positions of those elements that participate in ties.
tiepos(x, ...)
# S3 method for integer64
tiepos(x, nties = NULL, method = NULL, ...)
an integer vector of positions
a vector or a data frame or an array or NULL
.
NULL or the number of tied values (including NA). Providing nties
can speed-up when x
has no cache. Note that a wrong nties can cause undefined behaviour up to a crash.
NULL for automatic method selection or a suitable low-level method, see details
ignored
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
This function automatically chooses from several low-level functions considering the size of x
and the availability of a cache.
Suitable methods are sortordertie
(fast ordering)
and ordertie
(memory saving ordering).
rank.integer64
for possibly tied ranks and unipos.integer64
for positions of unique values.
x <- as.integer64(sample(c(rep(NA, 9), 1:9), 32, TRUE))
tiepos(x)
stopifnot(identical(tiepos(x), (1:length(x))[duplicated(x) | rev(duplicated(rev(x)))]))
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