Jue Xue

Hi Eunseok I am happy that you find the post which explains why your bounded variables are shown as "free" in the IIS instance.  Now, let us focus on your needs: 1. what to do in presence of an IIS...

Hi Eunseok, My understanding is that you have a different question at this point. Namely why "free was added" to the model while you have modeled them to be bounded. I will recommend you create a d...

Hi Eunseok, Let's analyze your original IIS model  (lp format). I see two problems: 1. log function can not take 0 or negative values. Setting gS[1,0], I[2,0], gterm_S_mul_I[1,0,2,0] free are inval...

Hi, Can you send a mps file that matches the original lp file (IIS model), i.e., the mps file for the IIS model that matches to your initial lp file? Since an infeasible model may have multiple IIS...

Thank you for the mps file. I am going to give it a try and get back afterward.

Hi Eunseok, To investigate if your model s infeasible, please do the following: 1. Share the model so we can reproduce the above model, and/or 2. Output the above model using .mps format. On the ot...

a single binary variable

Hi Saeid, See the bold part in the error message you get: "gurobipy.GurobiError: Indicator constraints can only be triggered by a single binary variable at a given value". So you may want to use an...

Hi Shouyuan,   Thank you for sharing your feedback. we will take it into consideration. In the meantime, please note we opt to keep the doc short, and sometimes may be oversimplified.   What you ha...

Hi Carmel,   Thank you for participating in Gurobi forum and contacting us.   Using abs_() will not hurt the linearity of your MILP.   If you want to know how this may work internally, I will expla...