v9.59.0

ModelingToolkit v9.59.0

Diff since v9.58.0

Merged pull requests:

• Add a mechanism to add additional passes to the end of structural simplification before completion. (#3201) (@BenChung)
• feat: enable structural_simplify(::SDESystem) (#3266) (@AayushSabharwal)
• CompatHelper: add new compat entry for Setfield at version 1 for package docs, (keep existing compat) (#3270) (@github-actions[bot])
• feat: add optional IfLifting simplification pass (#3272) (@AayushSabharwal)
• add option to include disturbance args in generate_control_function (#3273) (@baggepinnen)
• fix: retain system metadata when calling flatten (#3276) (@AayushSabharwal)

Closed issues:

• structural_simplify fails on SDESystem (#3261)
• Type instability with parameters that are abstract at system-level, but concrete at problem-level (#3262)
• Output of generate_control_function can no longer be traced symbolically (#3269)
• Unexpected behaviour of @register_symbolic (#3271)
• System metadata disapearing when calling complete on model with subsystems (#3275)

v9.58.0

ModelingToolkit v9.58.0

Diff since v9.57.0

Merged pull requests:

• Improved FunctionalAffect alternative (#2922) (@BenChung)

v9.57.0

ModelingToolkit v9.57.0

Diff since v9.56.0

Merged pull requests:

• feat: use HomotopyContinuationProblem in NonlinearProblem if possible (#3249) (@AayushSabharwal)
• build: bump version (#3264) (@AayushSabharwal)

v9.56.0

ModelingToolkit v9.56.0

Diff since v9.55.0

Merged pull requests:

• feat: initial implementation of SCCNonlinearProblem codegen (#3213) (@AayushSabharwal)

v9.55.0

ModelingToolkit v9.55.0

Diff since v9.54.0

Merged pull requests:

• Reorganizing tutorials (#2923) (@ArnoStrouwen)
• add capability to trace MTK dynamics with InfiniteOpt (#3220) (@baggepinnen)
• feat: propagate ODEProblem guesses to remake (#3226) (@AayushSabharwal)
• feat: add automatic variable discovery for OptimizationSystem (#3243) (@AayushSabharwal)
• fix: retain observed equations after structural_simplify of SDESystem (#3244) (@AayushSabharwal)
• Fix initialization_eqs example (#3250) (@ChrisRackauckas)
• fix: recalculate resid_prototype in remake_initialization_data (#3252) (@AayushSabharwal)
• update higher order documentation to modern MTK (#3255) (@ArnoStrouwen)
• add Lagrangian explanation to DAE reduction tutorial. (#3257) (@ArnoStrouwen)
• fix: retain system data on structural_simplify of SDESystem (#3258) (@AayushSabharwal)
• build: bump minor version (#3259) (@AayushSabharwal)

Closed issues:

• Not finding all variables in SDESystem (#3175)
• initialization_eqs example broken in initialization docs (#3245)
• type promotion bug with parameter dependent initialization_eqs (#3246)

v9.54.0

ModelingToolkit v9.54.0

Diff since v9.53.0

Merged pull requests:

• fix: propagate initializeprobpmap and update_initializeprob! to DAEFunction (#3227) (@AayushSabharwal)
• test: make initializaton tests runnable from OrdinaryDiffEq (#3232) (@AayushSabharwal)
• Fix type promotion in InitializationProblems with vectors in the u0map (#3234) (@SebastianM-C)
• feat: simplify initialization systems with fully_determined=true if possible (#3235) (@AayushSabharwal)
• fix: fix nonnumeric parameters in @mtkmodel (#3236) (@AayushSabharwal)
• fix: support callable parameters provided to discretes list of callback (#3237) (@AayushSabharwal)
• fix: fix SDEs with noise dependent on observed variables (#3238) (@AayushSabharwal)
• OptimizationProblem updates (#3241) (@aml5600)
• build: bump minor version (#3242) (@AayushSabharwal)

Closed issues:

• Matrix differential equations not working (#1496)
• Failed to ParentScope a variable array (#1945)
• Incorrect codegen for SDE system (#3089)
• Observed variable calculated incorrectly using new discrete parameters (#3199)
• structural_simplify fails to propagate variable simplification to noise equations (#3212)
• Can't have event "discretes" be callable parameter (#3215)
• Non-numeric parameters are broken inside @mtkmodel (#3231)

v9.53.0

ModelingToolkit v9.53.0

Diff since v9.52.0

Merged pull requests:

• fix: handle observeds in get_all_timeseries_indexes for split = false systems (#3221) (@AayushSabharwal)
• feat: add function to parse variable from string (#3224) (@AayushSabharwal)
• build: bump minor version (#3233) (@AayushSabharwal)

v9.52.0

ModelingToolkit v9.52.0

Diff since v9.51.0

Merged pull requests:

• feat: support polynomials of invertible functions in HomotopyContinuationExt (#3214) (@AayushSabharwal)
• fix: fix DAEProblem with array parameters (#3216) (@AayushSabharwal)
• build(deps): bump codecov/codecov-action from 4 to 5 (#3218) (@dependabot[bot])
• feat: add symbolic tstops support to ODESystem (#3219) (@AayushSabharwal)
• Remove unused variables (#3222) (@devmotion)
• fix: set defaults in modelingtoolkitize(::SDEProblem) (#3223) (@AayushSabharwal)

v9.51.0

ModelingToolkit v9.51.0

Diff since v9.50.0

Merged pull requests:

• CompatHelper: bump compat for OptimizationOptimJL to 0.4 for package docs, (keep existing compat) (#3066) (@github-actions[bot])
• CompatHelper: bump compat for Optimization to 4 for package docs, (keep existing compat) (#3067) (@github-actions[bot])
• fix: detect observed variables and dependent parameters dependent on discrete parameters (#3106) (@AayushSabharwal)
• feat: support multiple extend statements in MTKModel (#3173) (@ven-k)
• Support ODEs as equations in JumpSystem (#3181) (@isaacsas)
• fix: fix discrete callback condition with array variable (#3190) (@AayushSabharwal)
• feat: cache start system and solver in HomotopyContinuation interface (#3192) (@AayushSabharwal)
• Update stochastic_diffeq.md - fix Brownian coefficient (#3196) (@alhirzel)
• Fix documentation paragraph (#3198) (@hersle)
• Add docstring and oop array construction method for build_explicit_observed_function (#3200) (@BenChung)
• feat: support directly generating observed functions for tuples (#3202) (@AayushSabharwal)
• fix: fix getproperty syntax on structural_simplify(complete(sys)) (#3203) (@AayushSabharwal)
• fix: handle observed in remake_initializeprob (#3207) (@AayushSabharwal)
• Get rid of floating reference to drop_expr in tests (#3208) (@BenChung)
• feat: add support for bounds of array variables (#3209) (@AayushSabharwal)
• fix: enable using MTKParameters with generate_control_function (#3210) (@AayushSabharwal)

Closed issues:

• v9.15.0: When multiple @extend, only the last one takes effect (#2758)
• Array parameters and callbacks (#3154)
• Plotting no longer works for MTK JumpSystems over ODEProblems (#3188)
• Bug in remake_initializeprob on the current master (#3205)

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)