How to use MIPGap in JuMP

Answered

Matias Montecinos Jamett

September 04, 2020 21:27

I'm solving a MILP and I need to fix the GAP using MIPGap by Gurobi

How do I use it?

Thanks in advance

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Comments

2 comments

Official comment
Simranjit Kaur

Gurobi Staff

June 23, 2025 03:07 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?.
Eli Towle

Gurobi Staff

September 04, 2020 23:21 Edited
You can set the MIPGap parameter with the set_optimizer_attribute function:
```
model = Model(Gurobi.Optimizer)
set_optimizer_attribute(model, "MIPGap", 0.01)
```
Use the set_optimizer_attributes function to set multiple parameters at once:
```
set_optimizer_attributes(model, "MIPGap" => 0.01, "MIPFocus" => 1)
```
You can also set parameters inside of the \( \texttt{Model} \) constructor with the optimizer_with_attributes function:
```
model = Model(
    optimizer_with_attributes(
        Gurobi.Optimizer, "MIPGap" => 0.01, "MIPFocus" => 1
    )
)
```
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