v11.31.1

ModelingToolkit v11.31.1

Diff since v11.28.2

Merged pull requests:

• refactor: ensure init system is in terms of unknowns of DAE (#4631) (@AayushSabharwal)
• feat: add reversible transformation API (#4655) (@AayushSabharwal)
• feat: [AI] add isolate_subsystem (#4658) (@AayushSabharwal)
• refactor: update MTK to reversible transformations API (#4659) (@AayushSabharwal)
• build: restore accidentally removed sources entries (#4664) (@AayushSabharwal)
• build: bump MTKBase minor version (#4665) (@AayushSabharwal)
• Add analyze_initialization_jacobian — diagnose rank-deficient initialization (#4666) (@baggepinnen)
• build: bump MTK patch version (#4667) (@AayushSabharwal)
• refactor: store mm in TearingState (#4668) (@AayushSabharwal)
• Declare public API (unlock downstream ExplicitImports allow-lists) (#4669) (@ChrisRackauckas-Claude)
• As/bump version (#4673) (@AayushSabharwal)
• refactor: eliminate unnecessary maxiters warnings if missing_guess_value is not Error (#4674) (@AayushSabharwal)
• Release 1 subpackage(s) (#4676) (@ChrisRackauckas)
• Raise downgrade floors in ModelingToolkitBase (FunctionWrappers/ImplicitDiscreteSolve/OffsetArrays/BipartiteGraphs) (#4677) (@ChrisRackauckas-Claude)
• fix: fix bugs, improve type-stability (#4678) (@AayushSabharwal)
• Trajectory linearization: avoid per-timepoint recompilation; require op for loop-opening parameters (#4679) (@baggepinnen)
• Init test: accept NonlinearLeastSquaresProblem fallback for HydraulicSystem (#4681) (@singhharsh1708)
• fix: handle non-mtkcompile systems in full_equations initialization (#4682) (@AayushSabharwal)
• build_explicit_observed_function: remove unused dervals (#4683) (@KristofferC)
• reorder_parameters: avoid double lookup for identical key (haskey + getindex) and use get instead (#4684) (@KristofferC)
• cache parameters, namespacemap and reorder_parameters (#4685) (@KristofferC)
• build: bump MTKBase minor, MTK minor versions (#4686) (@AayushSabharwal)
• test: make tests less dependent on equation ordering (#4687) (@AayushSabharwal)
• Skip parameter args when rebuilding non-parameter array variables (#4689) (@KristofferC)
• use the cached reorder_parameters in a few more places (#4690) (@KristofferC)
• cache the concrete_getu call (#4691) (@KristofferC)
• compile one observed function for all CopyParamsByTemplate fallback batches (#4692) (@KristofferC)
• test: make inline linear SCC test more reliable (#4695) (@AayushSabharwal)
• Memoize split_indexed_var and get_stable_index (#4696) (@KristofferC)
• propagate the cached reorder_parameters to the SCC subsystems (#4697) (@KristofferC)
• Propagate ParameterArrayAssignments to SCC subsystems (#4698) (@KristofferC)
• As/bump version (#4699) (@AayushSabharwal)
• feat: set Initial(x) when setting x in LinearizationProblem (#4700) (@AayushSabharwal)
• [AI] Use declared inputs for input-aware codegen on compiled systems (#4702) (@SebastianM-C)
• feat: add necessary initial conditions API (#4703) (@AayushSabharwal)
• avoid recompiling multiple instances ofbuild_function_wrapper in some cases (#4705) (@KristofferC)
• build: bump MTKBase minor, MTK minor versions (#4707) (@AayushSabharwal)
• Raise ModelingToolkitBase DiffEqBase 7.x floor to 7.4.2 (fix downgrade VectorContinuousCallback crash) (#4709) (@ChrisRackauckas-Claude)
• fix nospecialize syntax in wrap_symbolic_linear_interface (#4713) (@KristofferC)
• Bump version to 11.31.1 (#4719) (@ChrisRackauckas)

Closed issues:

• Initialization test: HydraulicSystem returns NonlinearLeastSquaresProblem instead of SCCNonlinearProblem{LinearProblem} (#4680)
• linearize/get_sensitivity at a partial operating point on a DAE fails with OverrideInit instead of solving for the unspecified algebraic states (#4688)
• v11 regression for in plane multibody with rigid link (#4693)
• setsym/setu on a state of a LinearizationProblem silently no-ops; operating-point states must be set via Initial(state) (#4694)
• Equations with powers are broken (#4708)