Type Error Objective Function

Answered

Abbigail Stockman

February 21, 2023 01:49

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Hi! I am having this error come up when I run my code and I am unsure as to why. Can I get help fixing this?

error: TypeError: 'int' object is not callable

code:

import math
from gurobipy import GRB,Model

x = [0.1, 0.15, 0.35, 0.5, 0.65, 0.85, 0.95]
y = [2.5, 2.2, 1.8, 1.5, 1.3, 0.9, 0.4]

m = Model()
# Set parameters
m.setParam('OutputFlag',True)
# Add variables
z1 = m.addVar(name='z1') 
z2 = m.addVar(name='z2') 
z3 = m.addVar(name='z3') 
z4 = m.addVar(name='z4') 
z5 = m.addVar(name='z5') 
z6 = m.addVar(name='z6') 
z7 = m.addVar(name='z7') 
a = m.addVar(name='a') 
b = m.addVar(name='b') 
c = m.addVar(name='c')   
# Add constraints
m.addConstr(2.5-(a+(b*(0.1**3))+ c*math.log(0.1)) <= z1, name='c1')
m.addConstr(-(2.5-(a+(b*(0.1**3))+ c*math.log(0.1))) <= z1, name='c2')
m.addConstr(2.2-(a+(b*(0.15**3))+ c*math.log(0.15)) <= z2 ,name='c3')
m.addConstr(-(2.2-(a+(b*(0.15**3))+ c*math.log(0.15))) <= z2, name='c4')
m.addConstr(1.8-(a+(b*(0.35**3))+ c*math.log(0.35)) <= z3 ,name='c5')
m.addConstr(-(1.8-(a+(b*(0.35**3))+ c*math.log(0.35))) <= z3, name='c6')
m.addConstr(1.5-(a+(b*(0.5**3))+ c*math.log(0.5)) <= z4, name='c7')
m.addConstr(-(1.5-(a+(b*(0.5**3))+ c*math.log(0.5))) <= z4, name='c8')
m.addConstr(1.3-(a+(b*(0.65**3))+ c*math.log(0.65)) <= z5 ,name='c9')
m.addConstr(-(1.3-(a+(b*(0.65**3))+ c*math.log(0.65))) <= z5, name='c10')
m.addConstr(0.9-(a+(b*(0.85**3))+ c*math.log(0.85)) <= z6 ,name='c11')
m.addConstr(-(0.9-(a+(b*(0.85**3))+ c*math.log(0.85))) <= z6, name='c12')
m.addConstr(0.4-(a+(b*(0.95**3))+ c*math.log(0.95)) <= z7 ,name='c13')
m.addConstr(-(0.4-(a+(b*(0.95**3))+ c*math.log(0.95))) <= z7, name='c14')
# Set the objective
m.setObjective((1/7)*(z1 + z2 + z3 + z4 + z5 + z6 + z7), GRB.MINIMIZE())
m.optimize()

0

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:48

  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 21, 2023 02:03 Edited

  Hi Abbigail,

  You'll want to remove the brackets from GRB.MINIMIZE, it's not a function, and is just an integer in disguise. (Try print(GRB.MINIMIZE) for example).

  - Riley

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  Abbigail Stockman

  February 21, 2023 02:16

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  thank you so much!

   

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