Zheren Zhang
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Recent activity by Zheren Zhang-
additional argument in callback function
AnsweredHi 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...
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Retrieving the dual value from a model with quadratic constraints
AnsweredHi 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...
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Trouble with the Non-Integer Solution of Gurobi MIP-Optimizer
AnsweredHi 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...
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Retrieving the linear expression of a constraint
AnsweredHi 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 ...
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Binary variable ignored at multiplication
AnsweredHi 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 , ...