Using gurobi optimize variable

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Ramesh singh

2023年02月20日 10:52

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In the below code, A[i,k] is optimize variable (decision).  This decision variable will change the value of PN.  So i am trying to update the PN for when A[i][k] ==1. For example if M is 5 and P is 15, then it decides the which which k is best A[1][1], A[1][2], A[1][3], A[1][4], A[1][5] such that  A[1][1]+A[1][2]+ A[1][3]+A[1][4]+ A[1][5]=1

i am getting the following error (#error line) "TypeError: unsupported operand type(s) for -=: 'NoneType' and 'float' " in the constrs line. Kindly help to figure out mistake. 

A_initial=nmp1.array([0,1,2,3,1,2,3,1,2,3,4,5,3,4,5,3,4]) #1 to 16, index 0 is unused
PN= nmp1.array([[0,0,0,0,0,0,0,0,0],[0,1,2,3,4,5,6,7,8],[0,9,10,11,12,13,14,15,16]]) # PN[1], PN[2], PN[0] unused
CR=[0,1,1,1,2,2]

bw=nmp.uniform(1,1000,size=(16,5)) # matrix bw[1][1], bw[1][2]....bw[1][5], bw[2][1],....

for i in range(1,16):
    for j in range(1,6):
        A[i][j].Start=0
for i in range(1,16):
    A[i][A_initial[i]]=1
 

 for i in range(1,16):
    m.addConstr(t[i]==(t1[i]+ sum(bw[i,k]*A[i,k] for k in range(1,M+1))),"t") #optimize
   

for j in range(1,R+1):
    for i in range(1,P+1):
        PN[j,i]=0 
for i in range(1,P+1):
    for k in range(1,M+1):
        m.addConstr((A[i,k]==1) >> (PN[CR[k],i]==1)) #error line

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• Python

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 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.
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  Marika Karbstein

  • Gurobi Staff

  2023年02月21日 10:34

  Your example is not reproducible. But I think the issue is that you need to define PN as Gurobi variables as well if you want to change the values.

  This is not possible:

  A= m.addVar(vtype='B')
  B= 3
  m.addConstr((A==1) >> (B==2))

  and will produce the error

   TypeError: unsupported operand type(s) for -=: 'NoneType' and 'float'

  B needs to be defined as a variable as well

  A= m.addVar(vtype='B')
  B= m.addVar(vtype='I')
  m.addConstr((A==1) >> (B==2))

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