Filters a GTFS object by shape_ids, keeping (or dropping) the relevant
entries in each file.
filter_by_shape_id(gtfs, shape_id, keep = TRUE)A GTFS object, as created by read_gtfs().
A character vector. The shape_ids used to filter the data.
A logical. Whether the entries related to the specified
shape_ids should be kept or dropped (defaults to TRUE, which keeps the
entries).
The GTFS object passed to the gtfs parameter, after the filtering
process.
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()
data_path <- system.file("extdata/spo_gtfs.zip", package = "gtfstools")
gtfs <- read_gtfs(data_path)
shape_ids <- c("17846", "68962")
object.size(gtfs)
#> 811304 bytes
# keeps entries related to passed shape_ids
smaller_gtfs <- filter_by_shape_id(gtfs, shape_ids)
object.size(smaller_gtfs)
#> 99456 bytes
# drops entries related to passed shape_ids
smaller_gtfs <- filter_by_shape_id(gtfs, shape_ids, keep = FALSE)
object.size(smaller_gtfs)
#> 740840 bytes