Bradley Ning

Dear Eli, thanks for your kind help and very detailed response, it is work if u is defined variable. While in my original problem, the 'u' in my code actually is a combination of other variables, f...

Hi Eli, I understand how to get the value of a variable, while what I want is add constraint to T[i][j], T[i][j] are binary variables, and T[i][j] = T[i][j] or ( T[i][k] and T[k][j] ) with i, j, k ...

My logic experssion and operation is: T[i][j] = T[i][j] or ( T[i][k] and T[k][j] ) with i, j, k in T.keys() loops T[i][j] are binary variables, it looks like Guroby does not support such logic oper...

Hi Sonja: Thanks for your reply, I have copied a screen shot here. From the screen shot, we can find that: print(ttt['A']['A'], x_ij['B']['C']) the output is: <gurobi.Var T_A_A (value 0.0)> <gurobi...