variable in Gurobi

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Shahrzad Valizadeh

2024年05月31日 00:24

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If I want to run my model over few weeks, and for all days of the week as:

days of week = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
for week in range(2):

for day in days of week:

If I define my variables within the loop, do I need to define an index representing the day of the week for each of them as well?!

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  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:24

  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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  Mario Ruthmair

  • Gurobi Staff

  2024年06月18日 11:32

  Hi Shahrzad,

  Each call to Model.addVar() creates a variable and a corresponding handle to access it. Since you need access to the variables to build the constraints, you must organize and store your handles somehow. You can do this however you like in Python, but one approach might be to use a dictionary with the day strings as keys.

  Alternatively, Gurobi provides a so-called tupledict that organizes your variable handles. For example,

  vars = Model.addVars(days_of_week)

  would generate a dictionary with the day strings as keys and the variable handles as values.

  Best regards,
  Mario

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