Generate ordered ids of OD pairs so lowest is always first This function is slow on large datasets, see szudzik_pairing for faster alternative — od_id_order • od

Generate ordered ids of OD pairs so lowest is always first This function is slow on large datasets, see szudzik_pairing for faster alternative

od_id_order(x, id1 = names(x)[1], id2 = names(x)[2])

Arguments

x: A data frame representing OD pairs
id1: Optional (it is assumed to be the first column) text string referring to the name of the variable containing the unique id of the origin
id2: Optional (it is assumed to be the second column) text string referring to the name of the variable containing the unique id of the destination

Examples

x = data.frame(id1 = c(1, 1, 2, 2, 3), id2 = c(1, 2, 3, 1, 4))
od_id_order(x) # 4th line switches id1 and id2 so oneway_key is in order
#>   stplanr.id1 stplanr.id1.1 oneway_key
#> 1           1             1        1 1
#> 2           1             2        1 2
#> 3           2             3        2 3
#> 4           2             1        1 2
#> 5           3             4        3 4