List of Contributions

I changed the time limit and it does not work. I used LINGO and it took long time to get a way lower solution that the one CPLEX got me. I was sure that the codes are equivalent. When I forced the decision variables that I got from LINGO into CPLEX I got the same solution in both LINGO and CPLEX ...

Thanks Daniel, attached are the CPLEX files. The solution is 70159 \times 10^6. But using other solvers I got different decision variables with a solution of 3.26 \times 10^6. Forcing the decision variables of the other solver into CPLEX will get us a lower solution than the one we got using CPLEX. ...

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Sometimes I got an optimal solution using CPLEX but it is not the minimal one. I got a minimal solution using some other solvers. When I force the other decision variables (using other solvers) solution in CPLEX I got a solution that is less than the optimal. Some times the difference is so big. Optimality ...

Hi Daniel, Please change the variable z to be boolean instead of float+. Sorry for the typo. I am not sure what do you mean by engine model file as I am new to CPLEX. ------------------------------ Tareq Oshan ------------------------------

Thanks again. But I am getting an error for the expression line. Error is : unexpected character in "a". ------------------------------ Tareq Oshan ------------------------------

Thanks ALEX. I am not sure why did you use CP instead of CPLEX? What If I want to relax the variable y to be a continuous variable between 0 and 1? what should I use CPLEX or CP? what setting should I use so that I can solve the problem in shorter time? ------------------------------ Tareq ...

I have a non linear 0-1 problem. It is non convex. The nonlinearity came because of a multiplication of three 0-1 variables. Two variables have been replaced by one new variables and added the nessary constraints. CPLEX was unable to solve the problem in 24 hours. Then, one of the variables has been ...

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