About how to create variable x_ij

Answered

Fangke Wan

November 14, 2021 17:20

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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Official comment
Simranjit Kaur

Gurobi Staff

June 23, 2025 02:44 Edited
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

November 16, 2021 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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