Originally posted by: FANS_Nader_Al_Theeb

Hello,

I read some previous threads in this forum about

(Error: CPLEX Error 1217: No solution exists.)

I save my model as .LP file and check it, all constraints as I expected and the model is correct. I don't know why I receive such message.

How I can solve this problem and get the results?

Thanks
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Originally posted by: Eumpfenbach

Just taking a stab at this, but are you maybe referencing the solution field of a cplex object before solving (ie, within a loop or something)?
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Originally posted by: FANS_Nader_Al_Theeb

I don't know what you mean exactly, but I print some thing after each loop and I get it out, so I can say that the problem with solve

Thanks
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Originally posted by: SystemAdmin

Have you tried using the conflict refiner to figure out why CPLEX thinks your model is infeasible?
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Originally posted by: FANS_Nader_Al_Theeb

How it could be used? is there any command to do that?
Thanks
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Originally posted by: SystemAdmin

You can export the model to a SAV file and then use the interactive optimizer:

read model.sav
conflict

You can also do it directly in the code using CPXrefineconflict() or IloCplex::refineConflict().
See also this chapter in the user's manual.
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Originally posted by: FANS_Nader_Al_Theeb

Hi

I received "No conflict exists."
Thanks
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Originally posted by: SystemAdmin

Hm, that would mean that your model is feasible. Just to be sure, what you did was

cplex.exportModel("model.sav");
if ( cplex.solve() ) {
   cplex.getObjValue(); // This or querying other solution data throws an exception
}

What is the version of CPLEX you use? Did you use any non-default parameter settings? Could you attach your model here?
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Originally posted by: FANS_Nader_Al_Theeb

Hi

I found where is the problem when I use the if statement

Thanks a lot
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Originally posted by: caowenwei

I guess the reason is that you haven't call cplex.solve() before getting the solution
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Originally posted by: NRouge

Hi,

I'm new to CPLEX and I have a problem that my model worked fine with a sample of data, so I think it means my model has no problem, but when  I run with another sample of data it returns "No solution".

I don't know where the mistake is or how to find it. I attached my model below, please take a look. Thank you.

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@NgocHuynh 7107dfd5-f584-4bb6-bfc1-2cd5ea458b24​, I'd recommend that you start a new thread for this in the OPL forum.

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Originally posted by: NRouge

Hi,

Actually I wanted to but I don't know how to start a thread in this forum, please show me. And by the way, can you help me with my problem? Thanks.

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You should be able to just click on the "Start a Topic" button (at the link I provided above) and then fill in the details.  An OPL expert, or someone from the community will take it from there.

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Originally posted by: NRouge

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Which leads to https://www.ibm.com/developerworks/community/forums/html/topic?id=5d22754f-1f94-4933-9120-e68bb25d263c&ps=25#repliesPg=0

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