Extract Positions in redundant dimension table
keypos returns the positions of the (fact table) elements that participate in their sorted unique subset (dimension table)
keypos(x, ...) ## S3 method for class 'integer64' keypos(x, method = NULL, ...)
x |
a vector or a data frame or an array or |
method |
NULL for automatic method selection or a suitable low-level method, see details |
... |
ignored |
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).
an integer vector of the same length as codex containing positions relativ to codesort(unique(x), na.last=FALSE)
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
unique.integer64 for the unique subset and match.integer64 for finding positions in a different vector.
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))))
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