Zheren Zhang

Hi  I'm trying to implement a callback function in which a list of variables that not belong to the model has to be updated when a MIP solution is found. My approach is to add the virable as the ar...

Hi I've implemented a LP benders subproblem which fills the strong duality and retrieved the dual values of its constraints properly by calling Pi. Now I'm extending this benders subproblem to a NL...

Hi  I've implemented a benders decomposition and now I'm comparing its solution to the one of Gurobi. All integer variables of the model are binary. It seems that only if the input data is well des...

Hi I'm implementing a Benders Decomposition with the so called Two-Phase Approach in which I add the benders cuts of the model without any integrality constraint solved by classical Benders (phase ...

Hi I´m trying to multiply an binary variable with the Big-M factor which is set as 5e7 in a similar form as following: a = n * Big_M * (1 - x[i , j]) However, when n is not zero, the term (1-x[i , ...