Jacob Jin
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Jacob Jinさんの最近のアクティビティ-
Jacob Jinさんがコメントを作成しました:
Hi, I have fixed the error and retrieved the extreme ray. The extreme ray is a 0-vector. It is abnormal. Why gurobi fail to give a valid extreme ray? Thank you so much.
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Jacob Jinさんが投稿を作成しました:
Why the extreme ray Groubi retrieved is 0?
回答済みDuring the callback process(benders decomposition), for one step, when the dual is unbounded, the unbounded ray retrieved by Gorubi is 0-vector. I write this model to an lp file, read and optimize...
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Jacob Jinさんが投稿を作成しました:
Can we change the linear expression's lines randomly in gurobi ??
回答済みlin_exp_2 = K * sum( z_dual[i, l].x * model.getVarByName('z_' + str(i) + '_' + str(l)) for l in L for i in range(N + 1))+ K * sum(r_dual[i, j].x * model.getVarByName('r_' + str(i) + '_' + str(...
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Jacob Jinさんがコメントを作成しました:
Thanks!
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Jacob Jinさんがコメントを作成しました:
Hi Jaromil, How could I reset the coefficient of a specific variable in a specific objective function when I deal with a multi-objectives problem in Gurobi? Thank you so much!
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Jacob Jinさんがコメントを作成しました:
I find the point! from numpy import *import numpy as npimport pandas as pdimport gurobipy as gbfrom gurobipy import *from gurobipy import GRBfrom itertools import permutationsimport timeimport warn...
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Jacob Jinさんがコメントを作成しました:
Hi Jaromi, I have tried your suggestion but it didn't work. The thing I can ensure is that I didn't let the sub_dual problem be preresolved when I defined the objective function in the callback fun...
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Jacob Jinさんがコメントを作成しました:
Hi, Jaromił As for the difficulty we talked about, I realized that when I just set the sub_dual problem's presolve parameter as -1 in the callback function, the log result showed that the solver di...
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Jacob Jinさんがコメントを作成しました:
Sorry for that. Here is the c202.txt. https://drive.google.com/file/d/1sG4W6F2tGwZ7rTs-TVZOdHh-7FOweXYm/view?usp=sharing Thank you!
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Jacob Jinさんがコメントを作成しました:
Sorry, I didn't get your meaning about Could you please also incorporate this model change after the first iteration into your snippet to reproduce the issue? My core code: https://drive.google....