Zhongjin Lu
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Latest activity by Zhongjin Lu-
Zhongjin Lu commented,
Just one more piece of information: even the BestBd is below the obj value under the starting x values I give to Gurobi. This is puzzling to me.
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Zhongjin Lu commented,
Dear Riley, Following your suggestions, I tried to use some heuristic starting values. My question is that given that "Starting Obj Value using x[i].start" is 26.9437, why I got "User MIP start did...
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Zhongjin Lu commented,
Riley, Thanks for the suggestion. If I want to get the closest approximation to the best possible solution within a certain amount of time, is there any other parameters I can set? Thanks, Zhongjin
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Zhongjin Lu created a post,
Gurobi cannot find the solution after one day
AnsweredCan anything be done to solve the following problem? The dimension of x should be 3000. I have reduced it to 500 and Gurobi still cannot find the solution.import gurobipy as gpfrom gurobipy import...
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Zhongjin Lu commented,
Ahmed, Thanks a lot. I didn't realize that the default lower bound value is 0. Once I relax it, Gurobi finds the correct answer. Thanks! Zhongjin
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Zhongjin Lu created a post,
Why Gurobi cannot find the solution to a simple Quadratic Optimization Problem?
Answeredimport gurobipy as gpfrom gurobipy import GRBimport numpy as npimport scipy.sparse as sp# Create a new modelm = gp.Model("matrix1")# Create variablesx = m.addMVar(shape=7, vtype=GRB.CONTINUOUS, na...