Combine two ID values to create a single ID number
Combine two ID values to create a single ID number
od_id_szudzik(x, y, ordermatters = FALSE) od_id_max_min(x, y) od_id_character(x, y)
x |
a vector of numeric, character, or factor values |
y |
a vector of numeric, character, or factor values |
ordermatters |
logical, does the order of values matter to pairing, default = FALSE |
In OD data it is common to have many 'oneway' flows from "A to B" and "B to A". It can be useful to group these an have a single ID that represents pairs of IDs with or without directionality, so they contain 'twoway' or bi-directional values.
od_id* functions take two vectors of equal length and return a vector of IDs,
which are unique for each combination but the same for twoway flows.
the Szudzik pairing function, on two vectors of equal length. It returns a vector of ID numbers.
This function superseeds od_id_order as it is faster on large datasets
od_oneway
Other od:
dist_google(),
od2line(),
od2odf(),
od_aggregate_from(),
od_aggregate_to(),
od_coords2line(),
od_coords(),
od_dist(),
od_oneway(),
od_to_odmatrix(),
odmatrix_to_od(),
points2flow(),
points2odf()
(d <- od_data_sample[2:9, 1:2]) (id <- od_id_character(d[[1]], d[[2]])) duplicated(id) od_id_szudzik(d[[1]], d[[2]]) od_id_max_min(d[[1]], d[[2]]) n <- 100 ids <- as.character(runif(n, 1e4, 1e7 - 1)) # benchmark of methods: x <- data.frame( id1 = rep(ids, times = n), id2 = rep(ids, each = n), val = 1, stringsAsFactors = FALSE ) bench::mark( check = FALSE, iterations = 10, od_id_order(x), od_id_character(x$id1, x$id2), od_id_szudzik(x$id1, x$id2), od_id_max_min(x$id1, x$id2) )
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