Cass C

Hello Jaromił Thanks for the reply. I know a MIP problem can be sometimes tough to be solved. But here the trouble that I met is not mainly caused by MIP.  The loop I added in my model just aims to...

Hi, Riley, many thanks for this. It indeed solved my trouble. I put it in the wrong location before and that was why I got some issues. Best 

Hi Jaromił Najman Many thanks for the reply. I have went through some documents which mentioned, the reason might be the MIP. By using an automated solve loop, this may cause Gurobi to reuse older ...

Hi Jaromił Many thanks for this, you are right! It should be formatted in list or dictionary, or it won't work. Best  Qikun

I think I am now understand the approach, but generally, how can I add the ordering of these variables, is there any cases that I can learn something from? Variables in my model are already indexed...

Hi Many thanks for this but I did not get the method, could you please share more details on that? model.lp the LP file is attached please have look if it is required. Best  Cass

Yes, I agree with that, its a reasonable idea, as the objective function (minimize) will push the Q in right direction. But it seems the not very fast in finding the feasible solution.  Best  Cass

Many thanks Jaromił, I had a try on this. Seems the iteration time of each step decreased. Not sure if it works (7mins already now), the MPS file is attached and I will be grateful if you could ple...

Hi model.mps How about now? Best  Cass

model 2.zip Hi Jaromił Please have a look on this Many thanks  Cass