keypos {bit64}

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 class '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

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).

Value

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

Author(s)

Jens Oehlschlägel <[e-mail]>

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))))