bit64 (version 0.9-7.1)

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, …)

Arguments

x

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

method

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

…

ignored

Value

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

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) and orderkey (memory saving ordering).

See Also

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

Examples

# NOT RUN {
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))))
# }