Miranda
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Mirandaさんの最近のアクティビティ-
Mirandaさんが投稿を作成しました:
Running time is longer when the problem size is decreased
回答済みHello, I have a question regarding the Gurobi solver. I solved two mixed integer programmings (named MIP1, and MIP2 respectively) which are in the same structure/formulation (they are all set-pack...
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Mirandaさんが投稿を作成しました:
Is TimeLimit counting the cpu time or system time ?
回答済みHello, Gurobi can set the time limit by setting the parameter TimeLimit, but I am wondering is the Timelimit parameter set for total CPU time or system time (the time used to solving the model excl...
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Mirandaさんが投稿を作成しました:
Adding constraints to linear program
回答済みHello, I am currently solving a problem by adding new constraints to a linear program at each iteration, and then resolve the linear program from the beginning. I am curious about if there is any w...
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Mirandaさんが投稿を作成しました:
model the minimization of sum of inverse functions
回答済みHello, The problem I am solving is to minimize sum of 1/x[k] for k in range(n), under a set of linear constraints. I set the lower and upper bounds for each x[k] be greater than 0; therefore, 1/x i...
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Mirandaさんが投稿を作成しました:
Get the total number of added cuts by Gurobi
回答済みHello, After running the MIP model via Gurobi, the log file sometimes provides me how many certain cuts are added. Is it possible for me to get the total number of added cuts directly? For example...
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Mirandaさんが投稿を作成しました:
Root relaxation objective value is different from the objective value from continuous model
回答済みHello everyone, I have a question regarding the root relaxation objective value. The problem I am trying to solve is an integer program(IP). I modeled my problem as integer program (i.e. variable...
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Mirandaさんがコメントを作成しました:
Hello Matthias, Thank you for your quick response. I am currently model my problem as MIP and use callback function to add cuts. In my callback function, I set if where == GRB.Callback.MIPSOL, and ...
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Mirandaさんがコメントを作成しました:
Followup: I am guessing that I could model my original MIP problem in Gurobi and then use callback function to add my cuts during Gurobi's branch and bound process. Am I right? However, in my callb...
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Mirandaさんが投稿を作成しました:
implement cutting plane algorithm
回答済みHello, I am trying to find the optimal integer solution of a IP by solving a sequence of LPs instead of MILPs. What I am currently doing is I resolve the entire LP from sketch after adding some ce...
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Mirandaさんが投稿を作成しました:
How do I know the total running time used to get the optimal solution? (Understand the outputs of Gurobi)
回答済みHello, I got confused about understanding the outputs of Gurobi. I formulate a problem as a mixed integer program via Gurobi. I used the code 'model.optimize()' to find its optimal solution, and I...