bit64 (version 4.0.5)

tiepos: Extract Positions of Tied Elements

Description

tiepos returns the positions of those elements that participate in ties.

Usage

tiepos(x, …)
# S3 method for integer64
tiepos(x, nties = NULL, method = NULL, …)

Arguments

x

a vector or a data frame or an array or NULL.

nties

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.

method

NULL for automatic method selection or a suitable low-level method, see details

…

ignored

Value

an integer vector of positions

Details

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).

See Also

rank.integer64 for possibly tied ranks and unipos.integer64 for positions of unique values.

Examples

# NOT RUN {
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)))]))
# }