Zeyu Wang
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Latest activity by Zeyu Wang
Zeyu Wang created a post,
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...

Zeyu Wang created a post,
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;...

Zeyu Wang created a post,
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...

Zeyu Wang commented,
Thank you so much for your help Jaromił! That helps me a lot! Best, Zeyu

Zeyu Wang created a post,
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...