infeasible model has objective function value

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Iason Liagkas

• May 06, 2024 07:43

I am solving a model sequentially and it is feasible in the first iteration. In the second iteration the model becomes infeasible but I get an objective function value when I run subproblem.objVal. The objective function value I get is not the one there was from the first iteration. [value 1st iter=274055.48, value of second iter=2863.66]. Why do I get a function value in the second iteration? is there anything wrong? 

Kind regards
Iason

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  Iason Liagkas

  • May 06, 2024 07:47

  

  

  

  one thing that I suspect is that my model is within a function that I call in the below code:

  subproblem = SP_define(K,number_of_nodes,nodes,links,arcs,arcs_numeric,capacities,
                    capacity,free_flow_time,tau_0,rs,drs,xirsk,paths,I,T,C,F,
                    Sc,Riinit,drsaki,b0,b1,b2,b3,b4,li,hi,fi,crsi,min_path_time,
                    avg_speed,carParking,carPrice,carMilage,fuel_efficiency,fuel_price,
                    min_path_distance,temp,evBuyingPrice,evMilage,electricityPrice,evConsumption,
                    train_speed,train_travel__time,rsT_index,mu,P,Cc,Cin,Phi,BigM,path_time,
                    Y,Gammarsk,xa_max,lxa_max,ta_max,Tirsk_max,ypnum,mpnum,Pi2,theta,Rirsnum,lRirsnum)  

  When I have a model that I run that is not embedded in a function then when the model is infeasible I won't get a function value. Is this the case or am I missing something? 
  
  Kind regards 
  Iason

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  Jaromił Najman

  Gurobi Staff

  • May 06, 2024 08:06

  Hi Iason,

  Could you please post the log output of the infeasible run?

  Best regards, 
  Jaromił

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