filter_by_shape_id: Filter GTFS object by 'shape_id'

In gtfstools: General Transit Feed Specification (GTFS) Editing and Analysing Tools

Filter GTFS object by shape_id

Description

Filters a GTFS object by shape_ids, keeping (or dropping) the relevant entries in each file.

Usage

filter_by_shape_id(gtfs, shape_id, keep = TRUE)

Arguments

gtfs	A GTFS object, as created by read_gtfs().
shape_id	A character vector. The shape_ids used to filter the data.
keep	A logical. Whether the entries related to the specified shape_ids should be kept or dropped (defaults to TRUE, which keeps the entries).

Value

The GTFS object passed to the gtfs parameter, after the filtering process.

See Also

Other filtering functions: filter_by_agency_id(), filter_by_route_id(), filter_by_route_type(), filter_by_service_id(), filter_by_sf(), filter_by_stop_id(), filter_by_time_of_day(), filter_by_trip_id(), filter_by_weekday()

Examples

data_path <- system.file("extdata/spo_gtfs.zip", package = "gtfstools")
gtfs <- read_gtfs(data_path)
shape_ids <- c("17846", "68962")

object.size(gtfs)

# keeps entries related to passed shape_ids
smaller_gtfs <- filter_by_shape_id(gtfs, shape_ids)
object.size(smaller_gtfs)

# drops entries related to passed shape_ids
smaller_gtfs <- filter_by_shape_id(gtfs, shape_ids, keep = FALSE)
object.size(smaller_gtfs)

gtfstools documentation built on Nov. 24, 2022, 5:09 p.m.