I get this output :"Solver stopped prematurely. No integer feasible point found" in intlinprog function

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sahar
sahar 2015-6-22
编辑： Aravind 2025-1-29
I got this output:" Solver stopped prematurely. No integer feasible point found." when using intlinprog function to solve a linear optimization problem. The codes has been attached.

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Aravind
Aravind 2025-1-29
编辑：Aravind 2025-1-29
Hi @sahar,
The message "Solver stopped prematurely. No integer feasible point found" suggests that the “intlinprog” function was unable to find a solution that meets all the integer constraints of your linear optimization problem. You can try the following steps to troubleshoot and potentially resolve this issue:
  1. Check Constraints: Ensure your constraints are correctly defined and that a feasible region exists. Overly restrictive constraints are a common cause of infeasibility.
  2. Initial Solution: If possible, provide an initial feasible solution or a good starting point to help the solver converge to a solution.
  3. Relax Constraints: Temporarily relax some constraints to see if the solver can find a solution. If successful, gradually reintroduce the constraints to identify the one causing infeasibility.
  4. Increase Iterations or Time Limit: The solver might need more time or iterations to find a feasible solution. Consider increasing the “MaxTime” or “LPMaxIterations” options in the solver settings.
  5. Review Variable Bounds: Make sure the bounds on your variables are correctly set and not overly restrictive.
  6. Scaling Issues: Poor scaling can lead to numerical difficulties. Try normalizing your data if you suspect scaling might be an issue.
  7. Review Problem Formulation: Double-check your problem formulation to ensure it accurately represents what you intend to solve.
Additionally, reviewing the documentation of the “intlinprog” function at https://www.mathworks.com/help/releases/R2022a/optim/ug/intlinprog.html can be helpful to understand its limitations and assumptions. Certain problem types or sizes may exceed the solver's capabilities, or specific settings might be needed for optimal performance.
I hope this helps address your query.

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