tiepos: Extract Positions of Tied Elements

In bit64: A S3 Class for Vectors of 64bit Integers

Extract Positions of Tied Elements

Description

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

Usage

tiepos(x, ...)
## S3 method for class '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

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).

Value

an integer vector of positions

Author(s)

Jens Oehlschlägel <[e-mail]>

See Also

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

Examples

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)))]))

bit64 documentation built on Sept. 30, 2024, 9:23 a.m.