get_children_stops {gtfstools}

Get children stops recursively

Description

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).

Usage

get_children_stops(gtfs, stop_id = NULL)

Arguments

gtfs

A GTFS object, as created by read_gtfs().

stop_id

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.

Value

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 "".

Examples

data_path <- system.file("extdata/ggl_gtfs.zip", package = "gtfstools")
gtfs <- read_gtfs(data_path)

children <- get_children_stops(gtfs)
head(children)

# use the stop_id argument to control which stops are analyzed
children <- get_children_stops(gtfs, stop_id = c("F12S", "F12N"))
children