Returns the (recursive) children stops of each specified stop_id.
Recursive in this context means it returns all children's children (i.e.
first children, then children's children, and then their children, and so
on).
get_children_stops(gtfs, stop_id = NULL)A GTFS object, as created by read_gtfs().
A string vector including the stop_ids to have their
children returned. If NULL (the default), the function returns the
children of every stop_id in the GTFS.
A data.table containing the stop_ids and their children'
stop_ids. If a stop doesn't have a child, its correspondent child_id
entry is marked as "".
data_path <- system.file("extdata/ggl_gtfs.zip", package = "gtfstools")
gtfs <- read_gtfs(data_path)
children <- get_children_stops(gtfs)
head(children)
#> stop_id child_id
#> <char> <char>
#> 1: F12 E1
#> 2: F12 E2
#> 3: F12 E3
#> 4: F12 E4
#> 5: F12 E5
#> 6: F12 N1
# use the stop_id argument to control which stops are analyzed
children <- get_children_stops(gtfs, stop_id = c("F12S", "F12N"))
children
#> stop_id child_id
#> <char> <char>
#> 1: F12S B1
#> 2: F12S B3
#> 3: F12N B2
#> 4: F12N B4
#> 5: B1
#> 6: B3
#> 7: B2
#> 8: B4