How can I save the value of objective function in a variables

Answered

jiang yu

• February 23, 2024 05:56

For instance:

obj=[]
for i in range(10):
   m = Model("ILP")
   sensor_decision, vehicle_decision= {}, {}
   for i in range(2*number_of_sensors):
      sensor_decision[i] = m.addVar(vtype=GRB.BINARY, name="sensor_decision%d" % (i))
   m.update()
   for j in range(50):
      vehicle_decision[j] = m.addVar(vtype=GRB.BINARY, name="vehicle_decision%d" % (j))
   m.update()
.......
   m.update()
   m.setObjective((quicksum(vehicle_decision[i] for i in range(50))),GRB.MAXIMIZE)
   m.update()
   m.optimize()
   m.update()
   obj.append(quicksum(vehicle_decision[i] for i in range(50)))

print(opti())

But I can't get the value of objective function ,it shows[<gurobi.LinExpr: <gurobi.Var *Awaiting Model Update*> + <gurobi.Var *Awaiting Model Update*> + <gurobi.Var *Awaiting Model Update*> ...... 

0

• 

  Riley Clement

  Gurobi Staff

  • February 23, 2024 06:31

  Hi Jiang Yu,

  Please see the docs for LinExpr.getValue() where we demo this exact use-case.

  - Riley

  0

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