stri_rank: Ranking

Description

This function ranks each string in a character vector according to a locale-dependent lexicographic order. It is a portable replacement for the base xtfrm function.

Usage

stri_rank(str, ..., opts_collator = NULL)

Arguments

str

a character vector

...

additional settings for opts_collator

opts_collator

a named list with ICU Collator’s options, see stri_opts_collator, NULL for default collation options

Details

Missing values result in missing ranks and tied observations receive the same ranks (based on min).

For more information on ICU’s Collator and how to tune it up in stringi, refer to stri_opts_collator.

Value

The result is a vector of ranks corresponding to each string in str.

Author(s)

Marek Gagolewski and other contributors

References

Collation – ICU User Guide, https://unicode-org.github.io/icu/userguide/collation/

Examples

stri_rank(c('hladny', 'chladny'), locale='pl_PL')
## [1] 2 1
stri_rank(c('hladny', 'chladny'), locale='sk_SK')
## [1] 1 2
stri_rank("a" %s+% c(1, 100, 2, 101, 11, 10))  # lexicographic order
## [1] 1 3 6 4 5 2
stri_rank("a" %s+% c(1, 100, 2, 101, 11, 10), numeric=TRUE)
## [1] 1 5 2 6 4 3
# Ordering a data frame with respect to two criteria:
X <- data.frame(a=c("b", NA, "b", "b", NA, "a", "a", "c"), b=runif(8))
X[order(stri_rank(X$a), X$b), ]
##      a         b
## 6    a 0.0455565
## 7    a 0.5281055
## 1    b 0.2875775
## 3    b 0.4089769
## 4    b 0.8830174
## 8    c 0.8924190
## 2 <NA> 0.7883051
## 5 <NA> 0.9404673