Jiajie Zhang
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Activity overview
Latest activity by Jiajie Zhang-
Jiajie Zhang commented,
Hi Jaromił, I did not remember the specific parameter setting. These days I have tried many other parameter settings and have not found any infeasible solutions again. In case I find any infeasible...
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Jiajie Zhang commented,
Thank you very much David. That exactly what I want.
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Jiajie Zhang created a post,
Infeasible solution after addGenConstrPWL
AnsweredHi, I am working on the following entropy maximization problem I use addGenConstrPWL to piecewise linearize x*(1-lnx), following are my codes to solve the model. # generate points for PWLysh = zsh...
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Jiajie Zhang created a post,
Wrong root node number
AnsweredHi, I want to add cuts at root nodes. I first locate them by MIPNODE_NODCNT, but the node number is 5005. I am confused. Below are my codes. if where == MIPNODE: cnt = GRB.Callback.MIPNODE_NODC...
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Jiajie Zhang created a post,
Can I add a quadratic user cut in my callback function
AnsweredHi, can I add a quadratic user cut in my callback function? Thanks.
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Jiajie Zhang commented,
Dear Maliheh, Thank you very much for your help! I have tried the addGenConstr() and it works quite well. Best, Jiajie
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Jiajie Zhang created a post,
NonConvex for log constraint
AnsweredHi, I try to model the following entropy maximization problem with the following codes model = gp.Model() x = model.addVars(n, ub = 1, name = 'x') lnx = model.addVars(n,lb = -GRB.INFINITY, ub = 0, ...