Add a vehicle type to the model

Usage

add_vehicle_type(
  model,
  num_available,
  capacity,
  fixed_cost = 0,
  tw_early = 0,
  tw_late = Inf,
  max_duration = Inf,
  unit_distance_cost = 1,
  unit_duration_cost = 0,
  depot = 1L,
  start_depot = depot,
  end_depot = depot,
  reload_depots = integer(0),
  max_reloads = Inf
)

Arguments

model: A vrpr_model.
num_available: Number of vehicles available of this type.
capacity: Vehicle capacity.
fixed_cost: Fixed cost per vehicle used.
tw_early, tw_late: Vehicle shift time window (start/end). tw_late = Inf leaves the end of the shift unconstrained.
max_duration: Maximum route duration. Inf = unconstrained.
unit_distance_cost, unit_duration_cost: Variable cost per unit of distance and of duration for this type. Varying these (and capacity, fixed_cost) across calls enables a heterogeneous fleet.
depot: Index (1-based) of the depot vehicles of this type start from and return to. Shortcut to set start_depot and end_depot together.
start_depot, end_depot: Indices (1-based) of the start and end depots, in the order of add_depot(). Varying them across types enables the MDVRP (multiple depots).
reload_depots: Indices (1-based) of depots where vehicles of this type may reload/empty mid-route, enabling multi-trip routes. Empty (default) = no reloading.
max_reloads: Maximum number of reloads per route. Inf = unconstrained.

Value

The updated vrpr_model.

Details

Call add_vehicle_type() several times for a fleet with multiple vehicle types (different capacities, costs, shifts or depots).