Robert Parker

Data structures and utilities for (rolling horizon) dynamic optimization

1

## Summary/Motivation: I've had some data structures and utilities for dynamic optimization and rolling horizon case studies sitting on my hard drive for a while, and thought it was finally...

Equations skipped at inlets in 1-D control volumes

6

In 1-D control volumes, and some property package state blocks, equations are often skipped at the inlet (or points where `defined_state is True` in state blocks). This causes some inconveniences/problems...

Can't add `pressure_dx` in 1-D control volume without adding `pressure_balance` as well

6

For the pipeline models, I'd like to add a `pressure_dx` variable, and would like to use `ControlVolume1D`'s method for doing so. I do not, however, want a `deltaP` variable or...

PyNumero interfaces to SciPy square solvers

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## Summary/Motivation: Either for initialization or because we have a square problem, it is sometimes nice to solve square (nonlinear) systems of variables and equations defined by Pyomo components. Ipopt...

Desired utilities for hierarchical timer

5

## Summary I would like the ability to do two things with hierarchical timers: - Flatten the timer - Remove nodes from the timer ### Motivation I am benchmarking the...

The Hopcroft-Karp algorithm computes a maximum-cardinality matching of a bipartite graph. This algorithm is very useful, and I would like to use it in some other projects. I'm opening this...

Unavoidable `InfeasibleConstraintException` in NL writer for variable fixed outside of bounds

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## Summary If a variable is fixed to a value outside of its bounds, the NL writer throws an `InfeasibleConstraintException` in `cache_fixed_var`. This may be reasonable default behavior, but I...

## Summary Testing the `standard_repn_compute_values` option in #3068, I encountered a situation where `generate_standard_repn` did not perform a reduction that I would expect: ```python import pyomo.environ as pyo from pyomo.repn...

Add parallel variables/constraints to `report_numerical_issues`

3

Right now, `display_near_parallel_*` methods are considered "advanced diagnostic techniques" and only suggested if `report_numerical_issues` finds no issues. However, I would argue that they should be considered "numerical diagnostics" as they...

Parameter sweep `run_model` is hard to debug

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In `ParameterSweepBase`, we wrap `run_model` in a try/except with no specified exception. This seems a bit dangerous. For errors in solvers and other "black-box" subroutines, we probably want to record...