Originally posted by: sana_

Hi,

I want to understand the following IloException : No basis exists

I am solving a MIP using ILOG Concert Technology (Cplex & C++)

Thanks.
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#DecisionOptimization

Originally posted by: SystemAdmin

What basis do you think should be returned for a MIP? When solving a MIP there are plenty of LPs that are solved to optimality.
If you want the basis for the optimal solution then consider using IloCplex::solveFixed() and try to query the basis afterwards.
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Originally posted by: sana_

Thanks for your reply. I understand the B&B procedure.

What I want to understand : How Cplex can find the optimal solution and returns an exception in the same time !

In other words, getObjectiveValue returns a value, getStatus returns optimal, and I have the IloException in the same time.
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Originally posted by: sana_

I understand my error. In a MIP, there is no Basis of course.

When I query about the basis status of my variables, cplex throw an exception what is logic :)

Thanks a lot!
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: sana_

I understand my error. In a MIP, there is no Basis of course.

When I query about the basis status of my variables, cplex throw an exception what is logic :)

Thanks a lot!
#CPLEXOptimizers
#DecisionOptimization