Conflict set

Semih Özdamar

unread,

Dec 25, 2018, 3:46:24 AM12/25/18

to OPTANO Modeling

Can I see the “conflict set” after solving optimization model with ciplex solver in optano? Is it possible? Or how is possible?

ORCONOMY Team

unread,

Dec 25, 2018, 6:17:59 AM12/25/18

to OPTANO Modeling

Sure. That is quite easy. Please find all the details in the documentation: http://docs.optano.net/modeling/current/userDoc/advanced/conflicting_set.html

Also there is additional aid, if the model is not perfect yet: http://docs.optano.net/modeling/current/userDoc/advanced_examples.html#analyzing-the-model

Best,

jp

Semih Özdamar

unread,

Dec 25, 2018, 7:19:06 AM12/25/18

to OPTANO Modeling

Well http://docs.optano.net/modeling/current/userDoc/advanced/conflicting_set.html this example based on a Gurobi Solver. But my solver is Cplex Solver. Model infeasible but confilict set is null.

ORCONOMY Team

unread,

Dec 25, 2018, 9:57:52 AM12/25/18

to OPTANO Modeling

You're absolutely right. The cplex support for conflicting sets has not been activated in Modeling.

I'll have the developers take a look at it and check if we can add it quickly.

We'll, it's holiday time here. I'll check with the remaining crew. Please allow us a few days.

Thanks for your help. I'll get back to you as soon as possible.

Semih Özdamar

unread,

Dec 25, 2018, 10:34:45 AM12/25/18

to OPTANO Modeling

I will be ver glad. I look forward it. :)

Semih Özdamar

unread,

Jan 10, 2019, 1:17:33 PM1/10/19

to OPTANO Modeling

Have you made any progress?

ORCONOMY Team

unread,

Jan 10, 2019, 4:20:57 PM1/10/19

to OPTANO Modeling

Hi,

thanks for getting back. We have made use of the holidays and created a prototype using the cplex constraint refiner.

But we are not happy with the performance yet, it requires to re-load the matrix which will fail with very large objects.

We have not decided, wether we release the prototype as an alpha release or tune it to ou contentment before release it.

I'll keep you updated.

Best,

jp

Semih Özdamar

unread,

Jan 10, 2019, 11:11:57 PM1/10/19

to OPTANO Modeling

Hi, thanks for your interest.

I'm working on large-scale problems. I'm very glad to Optano and cplex. It's very successful and fast to solve these large scale problems.

Previously I was using cplex optimization studio but now using only Optano. Because in my opinion Optano is more useful, user friendly and has more advantageous.

So you know, how important to show "conflict sets", especially about large scale problems. Therefore I look forward to hearing from you. I'm sure you'll make the best solution.

Yours sincerely.

ORCONOMY Team

unread,

Jan 14, 2019, 9:08:55 AM1/14/19

to OPTANO Modeling

Hi,

we just updated nuget with Modeling Version 2.14.0-pre.

It features a ComputeIIS Parameter for Cplex 12.8.

Please test it thoroughly. We'd really appreciate your feedback.

A short demo "How to use it", is available here: https://github.com/orconomy/optano.modeling.examples/blob/master/Source/Demo_ComputeIIS/Program.cs

Best,

jp

Semih Özdamar

unread,

Jan 14, 2019, 9:41:27 AM1/14/19

to OPTANO Modeling

Thank you very much. Very nice to hear from you. But my cplex version is 12.6. :(. If you deploy with 12.6 I will be very glad. But if is not, I'll have to get a new version of 12.8. What do you suggest?

ORCONOMY Team

unread,

Jan 14, 2019, 5:18:44 PM1/14/19

to OPTANO Modeling

Well, cplex has improved a lot from Version 12.6 to 12.8. You might consider an update.

Anyway, please find the extended cplex 12.6 and 12.7 adapter in the newly release nuget 2.14.0.428-pre2.

This version supports ComputeIIS for both of the older versions.

Best,

jp

Semih Özdamar

unread,

Jan 14, 2019, 11:35:59 PM1/14/19

to OPTANO Modeling

Thank you very much. I will use it as soon as possible and back to you.

Regards best.

Semih Özdamar

unread,

Jan 15, 2019, 3:05:29 AM1/15/19

to OPTANO Modeling

Hi, I have just setup Cplex 12.8 and changed my projects dlls (ILOG.Concert and ILOG.CPLEX). But now there is a big problem (because now there is any solution) like picture below. Please help me.

ORCONOMY Team

unread,

Jan 15, 2019, 5:16:19 AM1/15/19

to OPTANO Modeling

Would you kindly step further (one line of code), to have the exception ex set?

I can not see, what exception throws.

I'd assume you have missed to copy cplex1280.dll or have not set up the path environment variable correctly (if you have used the cplex installer, have you restartet the system?)

Best,

jp

Message has been deleted

ORCONOMY Team

unread,

Jan 15, 2019, 6:43:33 AM1/15/19

to OPTANO Modeling

Sir, would you kindly put your break point in line 1353. I am pretty sure, we will not fix this issue without reading the exception.

Regarding step 2: I remember visual studio to require checks in front of the references. it holds the list of recent references, but will only use checked ones. The references need to appear in the solutions explorer, in the project and its folder "references"

Thanks.

Semih Özdamar

unread,

Jan 15, 2019, 6:51:37 AM1/15/19

to OPTANO Modeling

1. break point in line 1353

Message has been deleted

ORCONOMY Team

unread,

Jan 15, 2019, 7:09:13 AM1/15/19

to OPTANO Modeling

By the way I had no problem with performance.

Thank you very much Optano. :)

Best wishes.

ORCONOMY Team

unread,

Jan 31, 2019, 1:36:38 PM1/31/19

to OPTANO Modeling

We have released the RC Version of 2.14.0. the ComputeIIS code has been improved and calculates which Bound (upper or lower) is part of the conflict:

https://www.nuget.org/packages/OPTANO.Modeling/2.14.0.429

Best,

jp

Reply all

Reply to author

Forward