Originally posted by: PRIMARY Harry Vrazopoulos

Hello,

Does CPLEX v12.2 automatically identify problem types or is there a parameter I should set first?

I added some non-linear constraints to a MIP and when I run the model (through the JAVA API) I get "ERROR 1217: No Solution Exists".

Thx, hv
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Originally posted by: SystemAdmin

Yes, CPLEX automatically identifies the problem type. I guess "non-linear constraints" means quadratic constraints, since CPLEX cannot handle general non-linear constraints. What is the return status of the solve call? May it be that you are adding non-convex quadratic constraints (i.e., with a Q matrix that is not positive semi-definite)?

Tobias
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Originally posted by: PRIMARY Harry Vrazopoulos

Dear Tobias,

thank you for your reply. I guess the constraint I was adding to the MIP translates to a non-quadratic term although it is quite complex to investigate in order to be 100% sure.

So, I transformed the model to be solved by CPOptimizer which performs adequately at this stage of our project (pilot phase).

I will get back with more information when we move to actual development where solution time will have to be minimized.

Kind Regards,
Harry
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Originally posted by: PRIMARY Harry Vrazopoulos

Ok for now
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