Suyue Xu

Hi Riley Thank you for your suggestion!I tried to run the NoRel heuristic for 1200s,and it turns out shifting to phase 2 quickly.Here is the log: Set parameter UsernameSet parameter CrossoverBasis ...

as the big-M method is introduced to solve the C&CG subpoblem,I'm wondering if the value of constant M could make any difference.So I changed the constant value from 10^6 to 10^4,here is the log : ...

Thank you for your advice!

Hi Riley I've tried to experiment with MIPFocus and Cuts to set them to 3,and try different branch direction,but all these measures make no difference.What do you mean by "improving the lower bound...

Hi Jaromil Unfortunately the MILP model can find a solution in less than 10 min,but i'm still not satisfied with the efficiency.After I revised problems you mentioned above, it seems that the heuri...

Thank you, Jaromil I will try to clean up very small coefficients and pay attention to the numeric issues.Thank you for your kindly comment again!

Thank you for your comment! It seems that the model has numerical issues, as the binary variables could oscilate during the branch-and-bound.Here is the possible problem syntax(written in MATLAB wi...

Hi Mario It seems that the model is confronted with severe numeric issues as some warnings prompt after : Warning: Model contains large matrix coefficient range          Consider reformulating mo...

And here's also answers for your three suggestions: for suggestion 1, I'm worried about whether quardratic model would deteriorate the efficiency since the solving procedure is in a iteration.Also...

Thanks for the prompt response Mario! I have tried to reset these parameters:'Aggergate','AggFill' and 'IntFeasTol',but gurobi still finishes 'infeasible'.And after I set the parameter ' Feasibilit...