v9.50.0

ModelingToolkit v9.50.0

Diff since v9.49.0

Merged pull requests:

• fixing record from solution for observables in the BifurcationKit extension (#3161) (@vyudu)
• Implement initialize and finalize for symbolic callbacks (#3162) (@BenChung)
• fix: fix complete not properly expanding systems (#3168) (@AayushSabharwal)
• fix: support non-tunable parameters with DDEs (#3169) (@AayushSabharwal)
• fix: unpack components of the base sys in implicit extend (#3170) (@ven-k)
• CompatHelper: bump compat for SimpleNonlinearSolve to 2, (keep existing compat) (#3176) (@github-actions[bot])
• CompatHelper: bump compat for NonlinearSolve to 4, (keep existing compat) (#3177) (@github-actions[bot])
• CompatHelper: bump compat for NonlinearSolve to 4 for package docs, (keep existing compat) (#3178) (@github-actions[bot])
• Extend description and name in the same way (#3179) (@hersle)
• JumpSystem cleanup (#3180) (@isaacsas)
• fix: complete with split = false removes the index cache (#3184) (@AayushSabharwal)
• Rewrite perturbation example with Symbolics' new Taylor series functions (#3186) (@hersle)
• feat: add circular dependency checking, substitution limit (#3187) (@AayushSabharwal)
• add name of sys in show method (#3189) (@baggepinnen)
• build: bump version (#3191) (@AayushSabharwal)

Closed issues:

• Structural simplify broken for SDEs (#2614)
• Inifinite loop when solving an ODE with an unused NaN parameter (#3013)
• Guess for parameter not reflected in guesses of system (#3075)
• DDE handling gives error if tunable=false on parameters (#3165)
• @extend no longer works with components (#3167)
• Stream connector equations missing when used in subsystem (#3171)
• IntervalNonlinearSolve sometimes fails for externally registered functions (#3172)
• making SDESystem without using @mtkbuild (#3174)
• observed function broken on latest (#3183)
• Bad error reporting when guess is missing (#3185)

v9.49.0

ModelingToolkit v9.49.0

Diff since v9.48.0

Merged pull requests:

• Don't check units during initialization (#3119) (@ctessum)
• Improve interactive system browsing and add system description (#3132) (@hersle)
• fix: fix getproperty, hasproperty for simplified hierarchical systems (#3149) (@AayushSabharwal)
• feat: support rational functions in HomotopyContinuationProblem (#3151) (@AayushSabharwal)
• fix: fix flattening in complete (#3155) (@AayushSabharwal)
• fix: only evaluate required keys of varmap in process_SciMLProblem (#3156) (@AayushSabharwal)
• feat: add support for IntervalNonlinearProblem (#3157) (@AayushSabharwal)
• fix: fix denominator checking in HomotopyContinuationExt (#3158) (@AayushSabharwal)
• Update Documentation.yml to build docs with LTS (#3164) (@ChrisRackauckas)

Closed issues:

• IntervalNonlinearProblem support in MTK (#2672)
• Strange behaviour for SDEs with continuous callbacks (#2723)
• structural_simplify messes with hasproperty for parameters (#3016)
• Fails to initialize with units (#3086)
• ifelse in equations can produce error for ODEProblem (#3153)
• Documentation is outdated (#3163)

v9.48.0

ModelingToolkit v9.48.0

Diff since v9.47.0

Merged pull requests:

• towards BifurcationKit @0.4 (#3102) (@rveltz)
• fix: some fixes related to usage of array symbolics (#3126) (@AayushSabharwal)
• fix: fix in-place observed function generation (#3145) (@AayushSabharwal)
• fix: construct initializeprob if initial value is symbolic (#3146) (@AayushSabharwal)
• docs: bump docs compat for BifurcationKit (#3147) (@AayushSabharwal)
• fix: fix u0_constructor for DDEProblem/SDDEProblem (#3148) (@AayushSabharwal)
• test: fix u0_constructor test for SDDEProblem (#3150) (@AayushSabharwal)
• build: bump minor version (#3152) (@AayushSabharwal)

Closed issues:

• Updated ODEProblem parameters don't propagate to initializeprob (#2717)
• Updating parameter/variable values does not update values of dependant defaults (#2733)
• u0_constructor for DDEProblem (#3125)

v9.47.0

ModelingToolkit v9.47.0

Diff since v9.46.1

Merged pull requests:

• fix: several MTKParameters fixes (#2929) (@AayushSabharwal)
• feat: initial implementation of HomotopyContinuation interface (#3114) (@AayushSabharwal)
• Fix initialization.md (#3115) (@ChrisRackauckas)
• refactor: major cleanup of *Problem construction (#3121) (@AayushSabharwal)
• add trait and dispatch for collect_vars! (#3123) (@isaacsas)
• feat: extend all arguments of a base sys to sys (#3124) (@ven-k)
• fix: handle parameter dependencies with constant RHS (#3127) (@AayushSabharwal)
• docs: add tutorial for callable parameters (#3130) (@AayushSabharwal)
• ci: test with 1, lts and pre versions of julia (#3131) (@thazhemadam)
• fix: retain nonnumeric parameter dependencies in initialization system (#3135) (@AayushSabharwal)
• fix: handle array guesses in InitializationProblem (#3136) (@AayushSabharwal)
• feat: use observed equations for guesses of observed variables (#3137) (@AayushSabharwal)
• docs: add DataInterpolations to docs environment (#3139) (@AayushSabharwal)
• fix: respect bounds in modelingtoolkitize, make bounded variable irreducible (#3140) (@AayushSabharwal)
• Add support for the initializealg argument in SciMLBase callbacks (#3144) (@BenChung)

Closed issues:

• Allow variable array length for parameters in @mtkmodel (#2453)
• Cannot use structural parameter as array size (#2704)
• Constants Not Mapped to Defaults (#3044)
• Local variable name in @mtkmodel leaks into ODESystem constructor (#3059)
• Package upgrade causes Error uuid4 not defined in VSCodeDebugger.DebugAdapter (#3129)
• Events seemingly ignored in system model (#3142)

v9.46.1

ModelingToolkit v9.46.1

Diff since v9.46.0

Merged pull requests:

• Rewrite of SDE tutorial (#3084) (@ArnoStrouwen)
• Remove extra initial condition (#3116) (@ChrisRackauckas)
• Backwards compatibility of scope detection for Catalyst (#3117) (@ChrisRackauckas)

Closed issues:

• @mtkmodel fails to handle anonymous functions as positional arguments (#3045)
• Doc: empty plots at the bottom of the page Acausal component-based modelling (#3046)
• Broken plot on Acausal Component-Based Modeling documentation (#3088)
• 9.46 introduces breaking change in complete (#3118)

v9.46.0

ModelingToolkit v9.46.0

Diff since v9.45.0

Merged pull requests:

• fix: handle unknowns inside callable parameters when topsorting equations (#3105) (@AayushSabharwal)
• Support Symbolic Arrays of arbitrary length (#3107) (@ven-k)
• feat: better discover scoped parameters in parent systems (#3112) (@AayushSabharwal)
• fix: make vars search through arrays of symbolics (#3113) (@AayushSabharwal)

Closed issues:

• Solve does not solve initialization problem of remade problems (#2842)
• In MTK v9.42.0 ParentScope not working on expressions (#3101)
• Expression order bug in the codegen for initializeprobmap (#3109)

v9.45.0

ModelingToolkit v9.45.0

Diff since v9.44.0

Merged pull requests:

• feat: allow parameters to be unknowns in the initialization system (#2928) (@AayushSabharwal)

v9.44.0

ModelingToolkit v9.44.0

Diff since v9.43.0

Merged pull requests:

• Test master (#3094) (@ChrisRackauckas)
• fix first ODE perturbation example (#3098) (@karlwessel)

Closed issues:

• Cannot solve remake problem with vector parameter of non-Real (#3024)
• failure to access unknown from solution (#3065)

v9.43.0

ModelingToolkit v9.43.0

Diff since v9.42.0

Merged pull requests:

• Fix structural simplification of non-1-indexed variable arrays (#2671) (@hersle)
• Clean up generate_initializesystem() (#3051) (@hersle)
• Relax type constraints to allow callable parameters in pdeps (#3079) (@SebastianM-C)
• feat: improve error message when system contains array equations (#3081) (@AayushSabharwal)
• move symbolic details to Symbolics docs (#3095) (@ArnoStrouwen)
• Allow arrays in MTKParameters pullback (#3100) (@DhairyaLGandhi)

Closed issues:

• Symbolic-array system bug in counting equations and variables (#2597)
• Structural simplification fails on non-1-indexed variable array (#2670)
• Error when setting structural parameter to define Symbolic arrays in connectors (#3058)
• Providing parameter override errors with "Initialization expression currently not supported" (#3087)
• ODE system that solved in 9.32 does error in 9.42 (#3096)
• ODE system that solved before does error in 9.42 as Overdetermined, Rank Deficient Matrix (#3097)

v9.42.0

ModelingToolkit v9.42.0

Diff since v9.41.0

Merged pull requests:

• feat: support observed function generation for DDEs (#3053) (@AayushSabharwal)
• feat: allow users to set array length via args in @mtkmodel (#3055) (@ven-k)
• fix: check scope when discovering variables from equations (#3072) (@AayushSabharwal)
• test: do not mark inversemodel tests as broken (#3073) (@AayushSabharwal)
• Fix duplicate text in documentation (#3080) (@cstjean)
• CompatHelper: bump compat for DiffEqCallbacks to 4, (keep existing compat) (#3082) (@github-actions[bot])
• Start rewriting programmatically generating systems docs (#3085) (@ArnoStrouwen)
• fix: promote resid_prototype using tunables (#3090) (@AayushSabharwal)
• Revert "feat: allow users to set array length via args in @mtkmodel" (#3092) (@YingboMa)

Closed issues:

• Better initial condition handling for dummy derivatives (#1830)
• Lacking Documentation for using DynamicQuantities (Unitful is still used in dev docs) (#2462)
• Symbolic arrays: NameState has no field symbolify (#2720)
• HTML for arrays of underscored-parameters is broken (#3052)
• Add ModelingToolkit.getdefault to public API (#3071)
• structural_simplify for io system can lead to input derivatives in RHS (#3078)