v9.61.0

ModelingToolkit v9.61.0

Diff since v9.60.0

Merged pull requests:

• fix: @mtkmodel no longer makes @variables callable (#3217) (@AayushSabharwal)
• fix: properly handle rational functions in HomotopyContinuation (#3265) (@AayushSabharwal)
• feat: better inbounds handling and propagation for generated functions (#3277) (@AayushSabharwal)
• feat: add analysis points (#3285) (@AayushSabharwal)
• fix: minor bug fix in PolynomialTransformation (#3293) (@AayushSabharwal)
• Generic mechanism for debugging/logging functions (#3296) (@hersle)
• feat: allow remade initialization systems to be incomplete (#3301) (@AayushSabharwal)
• feat: add support for causal connections of variables (#3304) (@AayushSabharwal)
• DifferentialEquations -> OrdinaryDiffEqDefaults in readme (#3305) (@TorkelE)
• Add better SDESystem error when it hasn't been structural_simplify (#3316) (@vyudu)
• feat: support caching of different types of subexpressions in SCCNonlinearProblem (#3324) (@AayushSabharwal)
• fix: fix initialization of DiscreteProblem(::JumpSystem) (#3329) (@AayushSabharwal)
• test: added test for dae_order_lowering (#3335) (@sivasathyaseeelan)
• Fix dual type promotion in remake with dummy derivatives (#3337) (@hersle)
• fix: respect checkbounds in build_explicit_observed_function (#3339) (@AayushSabharwal)
• fix: only solve parameter initialization for NonlinearSystem (#3345) (@AayushSabharwal)

Closed issues:

• SDESystem's not displayed properly with latexify (#2069)
• Wonky interface for Dicrete/Continious callbacks when using ModelingToolkit (#2303)
• Events not working with automatic solver selection (#2741)
• Latexify display does not work for SDESystems (#2782)
• SDEs with brownian motions requires structural_simplify (#2831)
• Regression: Problem with indexing of JumpProblem (#2838)
• support connections between (causal) variables connect(var1, var2) (#3287)
• HomotopyContinuation extension of MTK breaks creation of ODESystems in PEtab.jl (#3291)
• Cannot remake problems if not providing full u0 and the first version did not require an initialization problem (#3295)
• Parameter initial conditions broken for DiscreteProblems (#3297)
• deepcopy leads to a failure in the initialization (#3307)
• Circular dependencies on Julia 1.10 (#3308)
• Dropped Variable (#3311)
• Some new problems with remake for Catalyst update (#3326)

v9.60.0

ModelingToolkit v9.60.0

Diff since v9.59.0

Merged pull requests:

• feat: create initialization systems for all problem types (#3253) (@AayushSabharwal)
• fix: fix timeseries_parameter_index for array symbolics (#3284) (@AayushSabharwal)
• build: bump OrdinaryDiffEqDefault compat (#3286) (@AayushSabharwal)
• build: bump minor version (#3289) (@AayushSabharwal)

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)