Deng Pan

Gurobi-versary
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Activity overview

Latest activity by Deng Pan
  • Deng Pan commented,

    Hi, Steve, The problem is solved. You are right that I actually put MIPGap attribute setting after optimize... I should've thought of that as I use MIPFocus and put it in the right place. Anyway, t...

  • Deng Pan commented,

    Hi, Gwyneth, I don't think I changed any MIPGap parameter, at least I don't recall. As I said, the only places I did something about the Gap are the two line of code I have sent: Gap=m.setParam('MI...

  • Deng Pan commented,

    Hi, Gwyneth, The only code I have about the log is the code to change the name of log when I export the log to a txt file. I rerun the model without exporting the log file (so in this way there is ...

  • Deng Pan commented,

    Or do you mean this: Gap=max(0, abs(m.ObjVal-m.ObjBound)/abs(m.ObjVal)) The one above and the one I sent in the previous email:Gap=m.setParam('MIPGap', 0), are the only two lines about gap I have i...

  • Deng Pan commented,

    Hi, Gwyneth,  Below is the entire log: Gurobi 9.1.1 (win64) logging started Sat Apr 3 17:09:29 2021 Changed value of parameter LogFile to P1_48_LFW_NoCap_Log 5 480 0.01 0.01 1 04032021-170929.txtPr...

  • Deng Pan commented,

    Hi, Gwyneth, I tried the following code: Gap=m.setParam('MIPGap', 0) But the gap is still the same as before. Before I report the gap with this code: Gap=max(0, abs(m.ObjVal-m.ObjBound)/abs(m.ObjVa...

  • Deng Pan created a post,

    How to have a solution with 0 gap

    Answered

    Hi, Is there a way to force Gurobi to generate solution with 0 gap? I got optimal solution with positive gap for a MIP model that minimize cost. I found a solution with lower objective function val...

  • Deng Pan commented,

    Hi Jaromil, It worked! Thank you so much! Best wishes

  • Deng Pan created a post,

    CPU time of first time to reach optimal solution

    Answered

    Dear community, I am wondering how to get the CPU time of first time to reach optimal solution. I use python API. Use the example below, in this case, the wall clock time of first found optimal sol...