liu heng
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liu hengさんの最近のアクティビティ-
liu hengさんが投稿を作成しました:
What is the difference between MIPSOL_OBJ and MIPSOL_OBJBST
回答済みMy understanding is that, MIPSOL_OBJ (Objective value for new solution) is the currently found objective, and MIPSOL_OBJBST is the best obj before this currently found incumbent. Thus MILSOL_OBJ p...
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liu hengさんが投稿を作成しました:
How to record the time whenever gurobi find a new incumbent(best feasible solution so far)
回答済みI want to record the primal bound along with the time spent, in order to plot the figure.
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liu hengさんが投稿を作成しました:
About PoolSearchMode
回答済みHow can I collect a rich set of feasible solutions (both high-quality and bad ones). It seems like PoolSearchMode=2 does not collect bad solutions while PoolSearchMode=1 does not collect the good o...
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liu hengさんがコメントを作成しました:
Thanks a lot! Can I just assume that when I call p = m.presolve(), then p and m are independent, modifications on either model will not affect the other?
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liu hengさんが投稿を作成しました:
Does modification on presolved model affect original model?
回答済みSuppose m is the original model and p = m.presolve() If I do some modifications on p (e.g. optimize or modify variable bounds), will the original model be modified?
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liu hengさんがコメントを作成しました:
This is much faster, thanks a lot!
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liu hengさんがコメントを作成しました:
Thank you Riley, I have tried this but there is still some issues: replace_fixings(m) spent much more time than m.presolve() (in fact my model has much more than 100 variables), I wonder if there i...
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liu hengさんが投稿を作成しました:
How to stop presolve from removing variables
回答済みAssume the original model m has 100 variables, and I fix 30 of the 100 variables by setting v.UB=1 , v.LB=1. I want to get the corresponding model with 70 variables. However, if I call p=m.presolve...
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liu hengさんが投稿を作成しました:
How to compute the objective and feasibility of a manually given solution?
回答済みSuppose "sol" is a list that consists of the value of each variable.(sol is given by user) How to compute the objective and feasiblity of sol
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liu hengさんが投稿を作成しました:
How to check the feasibility of a certain solution
回答済みSuppose I manually give a solution by setting v.Start = xxx. Then I call m.optimize() and the log only shows that "Loaded user MIP start with objective xxx". Does it means the solution is feasible?