Originally posted by: Farouk HAMMAMI

Hello,

I would just ask how to add new decision variables to a model at each callback?

Suppose, i am solving a model using CPLEX and Java. At each callback, i want to create three new boolean decision variables, to the main model, namely u_{callback_counter*3}, u_{callbackcounter*3+1} and u_{callbackcounter*3+2}.

Example, in the first callback (0), i create u_0, u_1 and u_2.

At the second callback (1) i create u_3, u_4 and u_5...

and so on.

Any example?

Thanks.

You cannot modify the main model while solution is in progress. CPLEX will throw an exception. You can make changes after the solve() method has returned, but not until then.