Units of distance and duration

[iedmrc]

Hi, what's the default (expected) unit for distance and duration across all the project? For example, in costs, what's the unit for distance? Is it in meters, kilometers, feet etc..?

costs (required): specifies how expensive is vehicle usage. It has three properties:

fixed: a fixed cost per vehicle tour
time: a cost per time unit
distance: a cost per distance unit

[reinterpretcat]

Hi,

it depends.

The solver itself doesn't assume any specific units when routing matrix is used: it should be just consistent. So, if you have meters and seconds in the routing matrix, then costs should be specified per second and meter.

If no matrix supplied, then the solver uses some approximation algorithm to calculate distance and duration between any two locations and it assumes that costs are defined using standard distance and time units: meters and seconds.

[iedmrc]

I needed that part

If no matrix supplied, then the solver uses some approximation algorithm to calculate distance and duration between any two locations and it assumes that costs are defined using standard distance and time units: meters and seconds.

Thank you for answer! But I've one more question, how does it check time windows and shifts when I provide a custom route matrix without any unit specified?

[reinterpretcat]

I've rechecked implementation and actually, seconds are assumed by default:

https://github.com/reinterpretcat/vrp/blob/master/vrp-pragmatic/src/lib.rs#L58

So, I need to update documentation