There is in-feasibility issue in Gurobi

Ziyad Mohamed

February 21, 2020 16:22

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for r in Requests :
for i in plocs :
    SIM.addConstr((quicksum (w[r,i,1,g,n] for g in tlocs for n in NodeVisits if w.get((r,i,1,g,n)) != None) 
    + quicksum (y[r,i,1,j,n] - y[r,j,n,i,1] for j in locs for n in NodeVisits if y.get((r,i,1,j,n)) != None if y.get((r,j,n,i,1)) != None  )
    + quicksum (v[r,i,1,j,n] - v[r,j,n,i,1] for j in locs for n in NodeVisits if v.get((r,i,1,j,n)) != None if v.get((r,j,n,i,1)) != None )) == Fr[(r,i)])

show me infeasible constraints but there is no synatic error but it's from formulation what can i do to solve it

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  December 06, 2024 00:49

  This post is more than three 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 why not try our AI Gurobot?.
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  Yuriy Zinchenko

  • Gurobi Staff

  February 24, 2020 21:36

  Hello Ziyad,

   

  please do not open another post, while you already have the issue discussed.

  The issue is not with Gurobi, but with your model.  What are you trying to obtain in this comparison,

   

  y.get((r,j,n,i,1)) != None

  ?

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  Ziyad Mohamed

  February 24, 2020 21:51

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  if is in my variable matrix on not 

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  Yuriy Zinchenko

  • Gurobi Staff

  February 28, 2020 01:07

  Have you had a chance to save an LP file and examine the model "by hand", to make sure your indices are correct etc.?

  You can save the model using

  > model.write("myModel.lp")

   

  Let me know what you observe.

   

   

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