Try our new documentation site (beta).


addSOS ( type, vars, wts=None )

Add an SOS constraint to the model. Please refer to this section for details on SOS constraints.


type: SOS type (can be GRB.SOS_TYPE1 or GRB.SOS_TYPE2).

vars: List of variables that participate in the SOS constraint.

weights (optional): Weights for the variables in the SOS constraint. Default weights are 1, 2, ...

Return value:

New SOS object.

Example usage:

  model.addSOS(GRB.SOS_TYPE1, [x, y, z], [1, 2, 4])

Try Gurobi for Free

Choose the evaluation license that fits you best, and start working with our Expert Team for technical guidance and support.

Evaluation License
Get a free, full-featured license of the Gurobi Optimizer to experience the performance, support, benchmarking and tuning services we provide as part of our product offering.
Academic License
Gurobi supports the teaching and use of optimization within academic institutions. We offer free, full-featured copies of Gurobi for use in class, and for research.
Cloud Trial

Request free trial hours, so you can see how quickly and easily a model can be solved on the cloud.