AttributeError: 'gurobipy.Var' object has no attribute 'w_permanent'

Question

so I have a problem when it process for printing variables, it can get a result but can not print the variables

I is months, J is productsname so my setting variables

w_permanent = M.addVars (J , I , lb=0 , vtype=GRB.INTEGER, obj=salary)
w_temporary = M.addVars (J , I , lb=0 , vtype=GRB.INTEGER ,     obj=salary )
w_hire      = M.addVars (    I , lb=0 , vtype=GRB.INTEGER ,     obj=cost_hire[j])
w_fire      = M.addVars (    I , lb=0 , vtype=GRB.INTEGER ,     obj=cost_fire[j])
Stock       = M.addVars (J , I , lb=0 , vtype=GRB.CONTINUOUS ,  obj=b)

if M.status == GRB.Status.OPTIMAL: 
    print ('Total cost : %10.2f euro' % M.objVal)
    print ('')
    print ('All decision variables:\n')
    print ('Stock per month per product:\n')
    for i in I:
        for j in J:
            print('x1 = %f' % w_permanent[i,j].w_permanent)

score 0 · Answer 1 · answered Oct 25 '18 at 22:15

0

Use the .X attribute to get the value of a variable in the current solution:

print('x1 = %f' % w_permanent[i,j].X)

answered Oct 25 '18 at 22:15

joni

6,840
2
13
20

Thank you so much! I can print it out now – Ruomei Oct 27 '18 at 11:21
I am still getting the same error, `AttributeError: 'gurobipy.Var' object has no attribute 'X'` – Shiv Krishna Jaiswal Nov 25 '21 at 12:40

AttributeError: 'gurobipy.Var' object has no attribute 'w_permanent'

1 Answers1