Specific order

[emreer...@gmail.com]

Hi all,

I want to optimize some of vehicles, so a few orders must be moved with certain vehicles. How can i add this as constraint to solver? Is it possible?

[Vincent Furnon]

Do you mean you want to constrain some orders to be delivered by a subset of the vehicles ? If yes just limit the domain of the VehicleVar of the order to the indices of the vehicles which can perform it.

On Mon, Jan 22, 2018 at 11:06 AM, <emreer...@gmail.com> wrote:

Hi all,

I want to optimize some of vehicles, so a few orders must be moved with certain vehicles. How can i add this as constraint to solver? Is it possible?

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[emreer...@gmail.com]

Hello Vincent,

Yes, that's exactly what I want to do. How can i limit the domain of the VehicleVar of the order to the indices of the vehicles? Can you explain with a few lines of code?

Thanks for quick response.

On Monday, January 22, 2018 at 8:45:52 PM UTC+3, Vincent Furnon wrote:

Do you mean you want to constrain some orders to be delivered by a subset of the vehicles ? If yes just limit the domain of the VehicleVar of the order to the indices of the vehicles which can perform it.

On Mon, Jan 22, 2018 at 11:06 AM, <emreer...@gmail.com> wrote:

Hi all,

I want to optimize some of vehicles, so a few orders must be moved with certain vehicles. How can i add this as constraint to solver? Is it possible?

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You received this message because you are subscribed to the Google Groups "or-tools-discuss" group.

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[emreer...@gmail.com]

Hi Vincent,

I handled my problem as you said. It's very simple(model.VehicleVar(order).SetValue(vehicle)).

Thanks a lot buddy.

[Gwénaël Rault]

Hello,

Juste a simple advice, for more a scalable solution, you should not remove the value -1 (no vehicle) from the VehicleVar. In the case where one of your node can't be inserted because of constraints, you should allow to unassign it.

[emreer...@gmail.com]

Hello Gwénaël,

My goal is double or more optimize our data, in first optimization i wont remove the value -1 from the VehicleVar. But in second optimization with same data with extra few orders I need to re-optimize while maintaining my first optimized state. Would that be a problem though? Thanks for your advice.

[Gwénaël Rault]

If your solution is feasible, you probably won't encounter any problem ;)

[Conner Westover]

Just for some clarification. You are doing model.VehicleVar(order).SetValue(vehicle) where you pass in every vehicle that can take this order? I am working in C# Or-Tools if that makes any difference.

Thanks,

Conner

[Vincent Furnon]

SetValue binds the variable to a single value. To bind it to multiple values, use SetValues passing an array of values. 

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