Zahra Hoobakht
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Activity overview
Latest activity by Zahra Hoobakht-
Zahra Hoobakht created a post,
non zero variable
AnsweredHi I have a variable that is in the interval of -1 and 1 but it cannot be zero. I would be appreciate if you help me to define the constraints properly. m = gp.Model()phi_0 = m.addVar(vtype=gp.GRB...
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Zahra Hoobakht commented,
Hi Jonasz thanks for your response. I narrow down my objective function to the numerator of trace which is 29*R1+17*R2 in which R1 and R2 are symbols coming from sympy library. I want to solve a mi...
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Zahra Hoobakht created a post,
Unable to convert argument to an expression
AnsweredHi I am trying to define my objective function but I am getting "Unable to convert argument to an expression" error. I am using the Sympy library because I need to get Hessian of some matrices bas...
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Zahra Hoobakht created a post,
unbdray
AnsweredHi my second stage problem is infeasible. I would appreciate it if you could say how can I extract unbounded rays for the dual of the second stage problem? I write dual of it and I used Dualproble...
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Zahra Hoobakht commented,
Hi Steven, the error is Unable to retrieve attribute 'ObjVal' of Master problem and when I see the .lp result it because the feasibility cut I added is not feasible itself. (Z is a positive value) ...
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Zahra Hoobakht created a post,
Unbdray does not give me correct answer
OngoingHello, I am trying to solve a problem in two ways with and without Benders decomposition. extract unbdrays and add them to my Master problem but when I extract them and put them into (w)(d-Bx)=<0 i...