Check and create an opportunities dataset.
assign_opportunities(destinations, opportunities_colnames)A list of Java-Array objects.
Either a data.frame or a POINT sf.
A character vector with the names of the
opportunities columns in destinations.
Other assigning functions:
assign_decay_function(),
assign_departure(),
assign_drop_geometry(),
assign_max_street_time(),
assign_max_trip_duration(),
assign_mode(),
assign_points_input(),
assign_shortest_path()