Extract Positions of Tied Elements
tiepos returns the positions of those elements that participate in ties.
tiepos(x, ...) ## S3 method for class 'integer64' tiepos(x, nties = NULL, method = NULL, ...)
x |
a vector or a data frame or an array or |
nties |
NULL or the number of tied values (including NA). Providing |
method |
NULL for automatic method selection or a suitable low-level method, see details |
... |
ignored |
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).
an integer vector of positions
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
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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