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

回答済み

jiang yu

2024年02月23日 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

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 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

  2024年02月23日 06:31

  Hi Jiang Yu,

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

  - Riley

  0

投稿コメントは受け付けていません。