About how to create variable x_ij

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Fangke Wan

2021年11月14日 17:20

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I want to create a variable which contain i is from 1 to 8, j is from 1 to 8

x_11, x_12, x_13, x_14, x_15, x_16,x_17, x_18,....., X_88

 

Does it have a convenient way to create rather than create them one by one. 

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:44 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11月16日 14:42

  You can use the addVars method for this task.

  import gurobipy as gp
  
  m = gp.Model("test")
  x = m.addVars(8,8,name="x")
  m.addConstr(x[0,7] - x[3,5] == 0)

  Please note that the indexing starts with \(0\) and ends with your value \(-1\). Thus, you can access \(\texttt{x}\) via \(\texttt{x[i,j]}\) with \(i,j \in \{0,\dots, 7\}\).

  Best regards,
  Jaromił

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