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

Answered

jiang yu

February 23, 2024 05:56

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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

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:29

  This post is more than two years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  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

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