The bounds of the variables

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ahmad alanaqreh

2021年11月30日 16:13

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I have a model where I define three variables as follows :

alpha[a] = model.addVar(lb=-GRB.INFINITY, name="alpha%d" % a)
beta[i, j] = model.addVar(lb=-GRB.INFINITY, ub=0, name="beta%d,%d," % (i, j))
lamda = model.addVar(lb=0, ub=GRB.INFINITY, name="lamda")

after creating the model  in the model.lp file, the variables define as follows:

alpha free
-infinity <= beta <= 0

but I can't find lamda which is supposed to be ???

lamda >= 0

where the objective function is to maximize the sum of these three variables ??

Thanks 

 

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:43 編集済み

  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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  Jaromił Najman

  • Gurobi Staff

  2021年12月03日 14:16 編集済み

  The default variable bound are \([0,\infty]\). If a variable is continuous and has default bounds (as is the case for \(\lambda\)), you will not find it in the bounds section of a Gurobi LP file.

  Best regards,
  Jaromił

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