Xintong Zhou
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Activity overview
Latest activity by Xintong Zhou-
Xintong Zhou created a post,
Potential Numerical Issue in MIP Solving
AnsweredHi,I am working on this small instance:Minimize OBJ: 162.98 x0 + 441.38 x1 - 419.67 x2 - 219.21 x3 Subject To c0: 71.79 x0 + 32.46 x1 + 98.05 x2 - 2.8 x3 >= -342.3374 c1: - 0.35 x0 + 6.47 x1 - 7.13...
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Xintong Zhou commented,
Thanks for the update!
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Xintong Zhou commented,
Hi Riley,Many thanks for your prompt reply! I will follow up the ticket.Xintong
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Xintong Zhou created a post,
Gurobi presolve mistakenly reports infeasibility for a feasible instance
AnsweredHi,I am working on this small LP instance:\* feasible *\ Minimize OBJ: 55.59 x0 + 20.64 x1 Subject To _C1: - 33.55 x0 + 55.79 x1 <= 4326 _C2: - 49.31 x0 + 39.55 x1 <= 3259.61 _C3: - 76.66 x0 - 42.3...
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Xintong Zhou commented,
Hi Ahmed,Thanks for your reply.Best,Xintong
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Xintong Zhou created a post,
Potential Numerical Bug in MIP Solving
AnsweredHi,I have a small MIP instance in LP format:\* seed *\ Minimize OBJ: - 48.46 x0 - 25.81 x1 Subject To _C1: 43.67 x0 - 65.24 x1 <= -2955.43 _C2: - 29.71 x0 - 3.98 x1 <= 2826.08 _C3: 42.8 x0 - 42.76 ...
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Xintong Zhou commented,
Hi Riley,Thanks for your explanation! Taking the presolved model into consideration makes more sense for this case. I see what's happening now. Thanks.
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Xintong Zhou created a post,
Confusing results of MIP solving with `FeasibilityTol=1e-9`
AnsweredHi,I have a very simple MIP instance in .lp format:\* *\ Minimize OBJ: 2.88 x0 Subject To _C1: - 58.13 x0 <= 4350.27 _C2: - 17.74 x0 <= 0 _C3: 92.9 x0 - 81.99 x1 <= 1106.82 _C4: 84.26 x0 - 20.45 x...
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Xintong Zhou created a post,
Potential Numerical Bug in MIP Solving
OngoingFor this instance https://gist.github.com/zxt5/dc43466d22ebdb82056796a35323a23aGurobi generates the optimal solution with the objective of 3754.. by default,but generates a solution with the object...
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Xintong Zhou commented,
But I can get consistent results with 12.0.2