Originally posted by: aliv87

Hello,

I am working on a problem with integer variables, but I would like to solve the linear version first. So, I changed the int decision variables to float, which I suppose makes the problem linear, but I did not get the optimal solution to this LP problem; instead, I got the Relaxed Solution. Also, I noticed in the engine log that MIP search method has been used to solve this LP problem. Why does CPLEX OPL use MIP in a problem with all float variables?

Thanks,

Ali

Hi

not only dvar int lead to mip 

logical constraints , abs , max and other constructions lead to mip

regards

Originally posted by: aliv87

Thanks Alex,

I see. Is there anyway to prevent CPLEX from giving the relaxed solution?

Ali

Hi

what do you mean ?

regards

Originally posted by: aliv87

I mean forcing CPLEX to either provide the optimal solution or state that the model is infeasible.

Ali

Hi,

in the .ops you should uncheck those 2 options: