Zeyu Wang
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Recent activity by Zeyu Wang
Update mipgap after each subproblem
AnsweredHi, The problem that I work on requires solving the same model with a different set of constraints until the predetermined time limit. However, I would like to update/force the optimality gap dyn...

Define an index set that is dependent on another two index sets  in Python
AnsweredHi, I'm transferring my model from AMPL to python now, but I could not figure out how to build the index sets that rely on other indices. s.t. c1{a in A}: sum{j in J, f in 1..F[a,j]} x[j,f+1] >= 1;...

Obtain information on lazy constraint and user cut introduced
AnsweredHi, May I know how to obtain the corresponding information after applying lazy constraint/user cut for an optimization problem? such as how much time does it take, or the number of lazy constraint...

Create multidimensional variables, read data file in C++
AnsweredHi, 1. I would like to create several multidimensional decision variables in C++ using const int I = 3;const int J = 4;const int K = 5;GRBVar* v[I];for (int i = 0; i < I; i++){v[i] = model.addVa...