ExVrp.Read (ExVrp v0.4.2)

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Reads VRPLIB format instance files.

A VRPLIB file contains a vehicle routing problem instance in a standardized text format. This module provides functions to parse these files and create an ExVrp.Model that can be solved.

Rounding Functions

When reading instances, you can specify a rounding function to apply to floating-point values:

  • :none - No rounding (default)
  • :round - Round to nearest integer
  • :trunc - Truncate to integer
  • :dimacs - Scale by 10 and truncate (for DIMACS benchmarks)
  • :exact - Scale by 1000 and round (for high precision)

Example

# Read a VRPLIB instance
model = ExVrp.Read.read("instances/E-n22-k4.vrp")

# With rounding
model = ExVrp.Read.read("instances/RC208.vrp", round_func: :round)

Summary

Types

round_func()

Functions

read(path, opts \\ [])

Reads a VRPLIB format file and returns an ExVrp.Model.

Types

round_func()

@type round_func() ::
  :none | :round | :trunc | :dimacs | :exact | (float() -> integer())

Functions

read(path, opts \\ [])

@spec read(
  String.t() | Path.t(),
  keyword()
) :: ExVrp.Model.t()

Reads a VRPLIB format file and returns an ExVrp.Model.

Options

  • :round_func - Rounding function to apply to values (default: :none)

Examples

model = ExVrp.Read.read("instances/OkSmall.txt")
model = ExVrp.Read.read("instances/E-n22-k4.vrp", round_func: :dimacs)