bit64 (version 4.6.0-1)

keypos: Extract Positions in redundant dimension table

Description

keypos returns the positions of the (fact table) elements that participate in their sorted unique subset (dimension table)

Usage

keypos(x, ...)
# S3 method for integer64
keypos(x, method = NULL, ...)

Value

an integer vector of the same length as x containing positions relative to sort(unique(x), na.last=FALSE)

Arguments

x

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

...

ignored

method

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

Details

NAs are sorted first in the dimension table, see ramorder.integer64().

This function automatically chooses from several low-level functions considering the size of x and the availability of a cache.

Suitable methods are

• sortorderkey (fast ordering)

• orderkey (memory saving ordering).

See Also

unique.integer64() for the unique subset and match.integer64() for finding positions in a different vector.

Examples

x <- as.integer64(sample(c(rep(NA, 9), 1:9), 32, TRUE))
keypos(x)

stopifnot(identical(keypos(x),  match.integer64(x, sort(unique(x), na.last=FALSE))))