v9.69.0

ModelingToolkit v9.69.0

Diff since v9.68.1

Merged pull requests:

• fix: fix incorrect folding in substitute in OptimizationSystem (#3475) (@AayushSabharwal)
• feat: support alternative AD backends in linearization (#3477) (@AayushSabharwal)
• fix: fix callable parameters in remake_buffer (#3492) (@AayushSabharwal)
• Fix ODEProblem over JumpProblem when there are no ODEs (#3496) (@isaacsas)

Closed issues:

• Clocks TODO (#1939)
• Creating of OptimizationSystem with registered function traces (#3473)
• Cannot use remake with callable parameters (#3490)

v9.68.1

ModelingToolkit v9.68.1

Diff since v9.67.0

Merged pull requests:

• feat: handle Initial(x) initialization_eqs in time-independent systems (#3466) (@AayushSabharwal)
• fix: fix analysis point transform ignoring too many connections (#3469) (@AayushSabharwal)
• Remove undefined exports (#3476) (@ChrisRackauckas)
• test: make model parsing tests more generic (#3478) (@AayushSabharwal)
• Format tutorial (#3479) (@hersle)
• fix: fix jump system hack (#3486) (@AayushSabharwal)
• CompatHelper: bump compat for DataInterpolations to 8 for package docs, (keep existing compat) (#3488) (@github-actions[bot])

Closed issues:

• Improve printing/display of XSystem parameters (#2651)
• Wrong value for problems when guesses are provided for default values (#3303)
• Unexpected results when using parameters in initial conditions (#3356)
• OptimizationFunction with AutoForwardDiff doesn't work with sparse ODEProblem (#3376)
• Errors and wrong solutions when solving NonlinearSystem with initialization_eqs (#3458)
• Clarify Comparison Against Modelica section of the documentation with regard to nonlinear systems (#3472)
• Regression: Can no longer solve SteadyStateProblems after remake (#3483)

v9.67.0

ModelingToolkit v9.67.0

Diff since v9.66.0

Merged pull requests:

• Change independent variable of ODE systems (#3437) (@hersle)
• fix: propagate tofloat, use_union to better_varmap_to_vars (#3448) (@vyudu)
• fix: Throw better warning when a guess is missing (#3456) (@vyudu)
• error message threw error message (#3457) (@baggepinnen)
• add toplevel arguments to various getters (#3462) (@TorkelE)
• Reduce TTF@mtkmodel (#3471) (@hexaeder)
• Fix docstring for InitializationProblem (#3474) (@baggepinnen)

Closed issues:

• Type promotion error when differentiating SteadyStateProblem (#3430)
• Jump simulations are Float64 valued (#3446)
• Better error message for missing guesses (#3449)
• Cannot simulate a certain ODESystem (probably one where everything gets simplified away) (#3467)

v9.66.0

ModelingToolkit v9.66.0

Diff since v9.65.0

Merged pull requests:

• feat: ImplicitDiscreteSystem (#3386) (@vyudu)
• fix: fix DEF parameters for split = true, flatten = false systems (#3403) (@AayushSabharwal)
• feat: implement SciMLBase.detect_cycles (#3427) (@AayushSabharwal)
• fix: fix symbolic maps given to linearize, warn in linearization_function (#3432) (@AayushSabharwal)
• feat: support analysis points duplicating existing connections (#3453) (@AayushSabharwal)
• Fix: Make build explicit observed function return Expr when expression=true (#3454) (@ashutosh-b-b)
• test: relax initializationsystem test (#3455) (@AayushSabharwal)
• fix: don't use === for comparison in variable metadata tests (#3463) (@AayushSabharwal)
• build: bump minor version (#3465) (@AayushSabharwal)

Closed issues:

• ImplicitDiscreteSystem (#2077)
• complete(sys; flatten=false) creates unexpected DEF parameters (#3322)
• DEF in parameters (#3401)
• Strange error when evaluating the Jacobian for certain systems (#3447)
• ODEFunction from the same ODESystem gives inconsistent ODE solve result (#3450)
• Can create NonlinearProblem with missing variables (#3461)
• Strange DEF parameter appears in parameter(sys) for certain systems (#3464)

v9.65.0

ModelingToolkit v9.65.0

Diff since v9.64.3

Merged pull requests:

• Replace Expronicon with Moshi (#3354) (@visr)
• fix(nonlinearsystem): Fix codegen issue for vector parameters (#3382) (@SebastianM-C)
• feat: run trivial initialization in problem constructor (#3404) (@AayushSabharwal)
• docs: add doc page for FMU import capability (#3405) (@AayushSabharwal)
• fix: allow passing guesses to linearize, improve linearization docs (#3412) (@AayushSabharwal)
• feat: add map_variables_to_equations (#3417) (@AayushSabharwal)
• feat: add isInitial (#3433) (@vyudu)
• CompatHelper: add new compat entry for FMI at version 0.14 for package docs, (keep existing compat) (#3434) (@github-actions[bot])
• CompatHelper: add new compat entry for FMIZoo at version 1 for package docs, (keep existing compat) (#3435) (@github-actions[bot])
• fix: separate Initial parameters into initials portion (#3439) (@AayushSabharwal)
• feat: allow NonlinearSystem(::ODESystem) and NonlinearProblem(::ODESystem) (#3440) (@AayushSabharwal)

Closed issues:

• Trivial initialization problem isn't solved when creating ODEProblem (#3290)
• remake failures (#3396)
• Add ability to provide additional guesses to linearize and family (#3400)
• remake issues (#3410)
• Cases of creation of NonlinearSystems have been broken (#3411)
• SciMLBase - equations bug fixed, but introduces new problems (#3421)
• isInitial function (#3431)
• Faulty non-boolean error in ifelse() (#3441)
• Broken amount of parameters: much more parameters in resulting ODEProblem than symbolic parameters in MTK system (#3444)

v9.64.3

ModelingToolkit v9.64.3

Diff since v9.64.2

Merged pull requests:

• fix: fix SCCNonlinearProblem reordering parameters (#3425) (@AayushSabharwal)
• build: bump patch version (#3426) (@AayushSabharwal)

Closed issues:

• Conditional branches inside @component statements do not support multiple components (#3424)

v9.64.2

ModelingToolkit v9.64.2

Diff since v9.64.1

Merged pull requests:

• add utilities and tests for disturbance modeling (#3314) (@baggepinnen)
• BVProblem with constraints (#3323) (@vyudu)
• fix: validate u0map and pmap (#3350) (@vyudu)
• Renaming discrete variables during structural simplification (plus refactoring tearing_reassemble) (#3379) (@vyudu)
• fix: fix array varables split across SCCs in SCCNonlinearProblem (#3384) (@AayushSabharwal)
• refactor: rewrite HomotopyContinuationProblem to target NonlinearSolveHomotopyContinuation.jl (#3385) (@AayushSabharwal)
• refactor: format (#3413) (@AayushSabharwal)
• fix: make the diffvar type check less restrictive (#3415) (@vyudu)
• feat: mark getproperty(::AbstractSystem, ::Symbol) as non-differentiable (#3422) (@AayushSabharwal)
• Replace vcat(eqs...) with reduce(vcat, eqs) (#3423) (@devmotion)

Closed issues:

• Nonsensical stuff is allowed in input paraemter maps (#3325)
• Calling reinit! makes the solver unstable (#3375)
• Solution somehow corrupted with IfLifting (#3383)
• Diffvar type check introduced in v9.63 causes error with complex diffvars (#3406)
• Re-creating MTK problems causes side effects (#3407)
• Can no longer simulate coupled ReactionSystem ODESystem (#3409)
• equations not defined??? (#3414)

v9.64.1

ModelingToolkit v9.64.1

Diff since v9.64.0

Merged pull requests:

• fix: fix several bugs (#3390) (@AayushSabharwal)
• build: bump patch version (#3402) (@AayushSabharwal)

Closed issues:

• Parameter splitting breaks runtime generated jacobians (#3294)
• Cases where remake seems to be mutating the original input in some way (#3395)
• breaking change in behavior of complete in non-breaking release (#3397)

v9.64.0

ModelingToolkit v9.64.0

Diff since v9.63.0

Merged pull requests:

• CompatHelper: add new compat entry for PreallocationTools at version 0.4 for package docs, (keep existing compat) (#3388) (@github-actions[bot])
• fix: allow vector of parameters for split system of pure tunables (#3389) (@AayushSabharwal)

v9.63.0

ModelingToolkit v9.63.0

Diff since v9.62.0

Merged pull requests:

• fix: Add metadata getters (#3334) (@vyudu)
• Validate types of state variables in ODESystem/SDESystem construction (#3340) (@vyudu)
• feat: always build initialization problem (#3347) (@AayushSabharwal)
• fix: handle scalarized array parameters in initialization (#3358) (@AayushSabharwal)
• refactor: centralize all code generation (#3360) (@AayushSabharwal)
• refactor: format (#3361) (@AayushSabharwal)
• Add @description to @mtkmodel (#3363) (@hersle)
• feat: add assertions functionality (#3364) (@AayushSabharwal)
• latexify equation (#3366) (@owiecc)
• refactor: default create_bindings to false in build_function_wrapper (#3367) (@AayushSabharwal)
• Fix parameter array handling in ImperativeAffect (#3368) (@BenChung)
• Fix @mtkbuild macro keyword parsing (#3371) (@AayushSabharwal)
• Support specialization in ODEFunctionExpr (#3373) (@devmotion)
• test: update reference tests (#3377) (@AayushSabharwal)
• add documentation page for DiscreteSystem (#3380) (@vyudu)
• build: bump minor version (#3387) (@AayushSabharwal)

Closed issues:

• It is possible to designate non-default types for variables, which are then ignored. (#2589)
• Missing metadata getters (#2643)
• Initialization System fails to remove an equation (#3312)
• remake ignores u0 updates when the initialization is trivial (#3318)
• Operating point passed to linearization_function closure has no effect (#3319)
• MTK does not allow building initialization systems for un-simplified systems (#3330)
• Initialization warning when creating certain SDEProblems from Catalyst (but not corresponding ODEProblems (#3331)
• Remake does not handle dual type promotion with dummy derivatives (#3336)
• Cannot solve ODE with Duals if it has initialization and callback (#3342)
• Determined complete system raises an overdetermined warn when creating ODEProblem (#3349)
• Initialization and Linearization (#3352)
• ODESystem not dealing with dynamic parameters (#3365)
• The IfLifting pass doesn't seem to be working quite right (#3369)