Match one order to another.

Source: R/match_order.R

Build a permutation p such that ids1[p] == ids2. See https://win-vector.com/2017/09/02/permutation-theory-in-action/.

match_order(ids1, ids2)

Arguments

ids1

unique vector of ids.
ids2

unique vector of ids with sort(ids1)==sort(ids2).

Value

p integers such that ids1[p] == ids2

Examples


ids1 <- c(4, 5, 7, 8, 9, 6, 1, 3, 2, 10)
ids2 <- c(3, 6, 4, 8, 5, 7, 1, 9,10, 2)
p <- match_order(ids1, ids2)
ids1[p]

#>  [1]  3  6  4  8  5  7  1  9 10  2
all.equal(ids1[p], ids2)

#> [1] TRUE
# note base::match(ids2, ids1) also solves this problem