Ashraf Ali
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Activity overview
Latest activity by Ashraf Ali-
Ashraf Ali commented,
Thank you Jonasz! That was very helpful. On another note, is there a way to report the time the solver took to find a feasible solution other than going back and looking at the log? Like a paramete...
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Ashraf Ali created a post,
continues variable that cannot take some values in a range
AnsweredHello everyone, I have a non-negative continues variable, that for some indices it cannot take a value between two numbers. Let me show you with my code. let's say the variable is defined over a l...
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Ashraf Ali commented,
Mario, Thank you for your response. Sorry for the confusion, but that was I mistake in my post that I have corrected. Yes I was trying to limit facilities to one type of products but that was wrong...
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Ashraf Ali created a post,
Facility location problem with a variable capacity constraint
Awaiting user inputI have a classical facility location problem with product type. Fac : set of facilities Cust : set of customers Pro : product type x = m.addVars(fac, cust, pro,vtype=GRB.BINARY,name="assign")y = ...
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Ashraf Ali commented,
Thank you so much! I really appreciate your help and I hope you have a happy Holidays.
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Ashraf Ali commented,
Hello Eli, I hope you are doing well. I'm sorry about bugging you revisiting this. I have been trying to include a new idea in this problem and wanted to get an opinion in my approach. So far eve...
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Ashraf Ali commented,
Hello Eli, Thank you so much. One more question and hopefully the last- sorry for bugging you with this. How do I take advantage of the symmetry here? I gave it a shot but didn't work. Here is wh...
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Ashraf Ali commented,
Hello Eli, I hope you are doing well. Currently I'm running a mid-large instance of this quadratic problem- with 100 Loc and 30 Fac. Building the objective function takes a long time. I broke dow...
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Ashraf Ali commented,
Thank you so much Eli, and sorry for the mistake I missed. Is there any sources you are aware of about how quadratic programming is handled in Gurobi? I found few examples here and there, but the l...
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Ashraf Ali created a post,
Objective function coefficients don't match the data in a Quadratic problem
AnsweredHello everyone. I have regular quadratic assignment problem with n locations and n facilities First I read the distance between the locations and the shpements between the facilities from Excel ...