The bounds of the variables

Answered

ahmad alanaqreh

• November 30, 2021 16:13

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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• Official comment

  

  Simranjit Kaur

  Gurobi Staff

  • December 06, 2024 00:22

  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?.
• 

  Jaromił Najman

  Gurobi Staff

  • December 03, 2021 14:16
  • Edited

  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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