Jordan Makansi

Solver returns “A feasible solution was not found, so no solution can be loaded”, even though a feasible solution is clearly available.

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## Summary I’m running a fairly simple robust optimization problem, to which I know there exists a feasible solution. The separation problem seems to find an optimal solution many times,...

PyROS causes Python to crash when solving a model with uncertainty set constrained to be a single value.

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In running my PyROS models, I occasionally get an error that there was no feasible solution found. Even for problems to which I *know* there is a feasible solution. Of...

With no initial value for uncertain parameter, PyROS complains "ValueError: User must designate at least one uncertain parameter."

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## Summary With no initial value for uncertain parameter, PyROS complains `ValueError: User must designate at least one uncertain parameter.` We should improve this error message to be more informative....

Example in PyROS docs doesn't use solver of the correct class

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The example taken from the docs https://pyomo.readthedocs.io/en/stable/contributed_packages/pyros.html?highlight=pyros#step-3-solve-with-pyros Does not work. ``` ` # === Designate which variables correspond to first- and second-stage degrees of freedom === first_stage_variables =[m.x1, m.x2, m.x3,...

## Summary When solving using IPOPT, it solves successfully, but when loading the results, it checks for timing data in `pyros_algorithm_methods.py`, and then doesn't find them so it barfs. We...

How to specify continuous set of uncertain parameters per each discrete scenario in PyROS?

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## Summary My suggestion is to allow continuous set of uncertain parameters per each discrete scenario ### Rationale Many practical problems require it, and plus it is still within the...

I’m experimenting with intersection uncertainty sets, and I’ve run into a problem where: - The nominal point is in the intersection set - But PyROS implies that the intersection is...

"Solver <class 'pyomo.contrib.appsi.base.SolverFactoryClass.register.<locals>.decorator.<locals>.LegacySolver'> is not available (NeedsCompiledExtension)" when attempting to call `appsi_ipopt`

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## Summary I cannot get `appsi_ipopt` to be recognized by pyomo. Although it recognizes `ipopt`, and I have Here's what I did to install `appsi_ipopt` - I ran`python build.py` per...

IPOPT solver does not work on PyROS Usage Example

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## Summary I’ve been experimenting with different solvers to see which ones to use under which robust optimizations. So, I started with the example provided under https://pyomo.readthedocs.io/en/stable/contributed_packages/pyros.html#pyros-usage-example. However, I was...

Nominal value affects robust feasibility even when `solve_master_globally=True`?

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## Summary Below I’ve shown a very simple problem for which PyROS is still unable to find a robust feasible solution when I use IPOPT as the local and global...