Status Code 0

[bShetty]

Even though Gurobi correctly solves my problem, the status code is always 0.

I use int status = model.get(GRB_IntAttr_Status); to get the status. This is generally not a problem. However, I would like to know when my problem becomes infeasible and this is not possible as my status is 0.

I went through the documentation and I could not find anything about status code 0. I can run IIS and see the constraints when it is infeasible but status is 0 for all states.

Has anyone come across this issue?

Any help/suggestions is greatly appreciated.

Thanks,

BYS

[Greg Glockner]

There is no status code 0:

http://www.gurobi.com/documentation/6.5/refman/optimization_status_codes.html

To understand how to use the Status value, see a simple example such as lp from the examples subdirectory.

[bShetty]

Thank you. I know there is no status code 0 but I get this status code 0. I have seen and run the example code and they run fine. However when I use the same in my problem, I get 0 as status code.

As I said everything else works fine. It's just this status code quirkiness.

I can even attach my code if you would like to see.

Thanks again,

BYS

[Kostja Siefen]

Can you post a minimal example that prints 0?

int status = model.get(GRB_IntAttr_Status)

cout << status

[bShetty]

Thank you very much!

I have attached my test file along with the printscreen of status 0. My visual studio environment matches that given in the example file. I have /MTd selected in the run time library and the corresponding library file linked.

Thanks again!

BYS

[Kostja Siefen]

With Gurobi 6.5.0 (/MTd) and Visual Studio 2015 I cannot reproduce this. Your example gives status = 2 (OPTIMAL) like it should (see attached screenshot).
Can you give more information about your environment (Windows version, Visual Studio version, Gurobi version)?

Best wishes, 

Kostja

[bShetty]

Windows 7 enterprise and Visual studio 2012. I have Gurobi 6.5. The interesting part is that when I paste my code to the example file, it gives the correct output. The problem arises when I try to run using my existing project.

As you can see, it solves the problem but gives wrong status. 

Thanks,

BYS

[Kostja Siefen]

Can you compare the Visual Studio project and solution files (i.e. look for differences between the example project and your project)?

Best wishes,

Kostja

[Kostja Siefen]

Please make sure you don't mix different versions or debug compiles with optimized libraries and that you use the right .lib file(s). With /MTd on Visual Studio 2012 you should have a linker dependency on gurobi_c++mtd2012.lib and gurobi65.lib.To check this please look at your project properties ("Linker" >> "Input").

Best wishes,

Kostja

[Bhupesh Shetty]

Thank you so much for taking time to help me debug this issue. The issue was with the header file! Even though I kept updating the library files, I forgot to update the corresponding gurobi_c++.h file!

Thanks again for solving this issue!

BYS

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