Checking new RHS in multiple Scenarios

Answered

Xinshuo Yang

October 14, 2022 02:24 Edited

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I am using the multiple scenario Gurobi model in Python where in one of the scenarios I changed the RHS by:

constr.ScenNRHS = new_RHS

 

Now I would like to see whether this change has been successfully made, so I wrote:

 

print(constr.ScenNRHS)

 

to see the updated RHS, but got the following error message:

 

File "src/gurobipy/constr.pxi", line 67, in gurobipy.Constr.__getattr__
  File "src/gurobipy/constr.pxi", line 95, in gurobipy.Constr.getAttr
  File "src/gurobipy/attrutil.pxi", line 100, in gurobipy.__getattr
AttributeError: Value of parameter ScenarioNumber is larger than the number of scenarios.

 

I was wondering if this is the correct way to check the new RHS?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:27

  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 try Gurobot, our chatbot interface offering instant, expert-level support.
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  Marika Karbstein

  • Gurobi Staff

  October 14, 2022 06:25

  I think you need to call a model update before printing the attribute. 

  Model modifications (bound changes, right-hand side changes, objective changes, etc.) are placed in a queue and are applied to the model when calling update, optimize, or write. After that they are accessible.

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  Xinshuo Yang

  October 14, 2022 13:16

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  That makes sense. Thank you.

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