Ariel W
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Activity overview
Latest activity by Ariel W-
Ariel W created a post,
how to add new coloumns into the left side of constraints?
Answeredfor example, i design original constraints like: c1: a1*x1+a2*x2=1c2: a3*x1+a4*x2=1c3: x1+x2 ≤ 5 while new constraints will be c1: a1*x1+a2*x2 + a5*x3 + a6*x4=1c2: a3*x1+a4*x2+ a7*x3 + a8*x4=1c3: x...
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Ariel W commented,
Thanks Bot, for your detailed explanation, I got the principle behind this!
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Ariel W commented,
Thanks! But still a little bit question: Does Gurobi continue the downward branching iterative calculation on the basis of this input solution or anything else?
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Ariel W created a post,
May I ask whether part of the results of the heuristic algorithm search designed by myself can be input into Gurobi
AnsweredMay I ask whether part of the results of the heuristic algorithm search designed by myself can be input into Gurobi, so that Gurobi can continue to iterate on this basis? The heuristic algorithm he...
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Ariel W commented,
Thanks for your careful reply,Soares. I will find the way for optimizing my model based on your advice.
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Ariel W commented,
Thanks Soares! I got what the meaning of this, but when i use the "model.relax()" in my program, it seems to ignore almost all constraints as my constraints are seemly all related to binary variabl...
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Ariel W created a post,
How to use the function "model.relax()"?
AnsweredUsing relax function of Gurobi can we derive the bound of original model? can it help me simplify the MIP model solving? how can i do this, please give me an example. Thank you!
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Ariel W commented,
Dear Sir, Thanks for your reply. I still have some questions below, which hope for your gentle advises. Q1: In my model, trips need to be all assigened. How this situation will be solved? Q2: And h...
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Ariel W created a post,
How to set the priority of certain types of decision variables in Gurobi
Awaiting user inputIn my model, s[v,i,j] and w[d,i,j] represent whether vehicle v operates trip j after trip i, and driver d operate trip j after trip i, respectively, they are all binary variables. I want to give p...
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Ariel W commented,
Sorry, Riley. Waste your time. When I just revisited my code, I found typo. It can work with two similar index. Thank you!