v9.75.0

ModelingToolkit v9.75.0

Diff since v9.74.0

Merged pull requests:

• CompatHelper: bump compat for JuliaFormatter to 2, (keep existing compat) (#3128) (@github-actions[bot])
• fix: handle derivatives of time-dependent parameters (#3493) (@AayushSabharwal)
• fix: fix remake(::JumpProblem) (#3581) (@AayushSabharwal)

Closed issues:

• Code generation contains Differential when equations contain variable time parameter (#3480)
• remake no longer works for ODE-jump models (#3571)

v9.74.0

ModelingToolkit v9.74.0

Diff since v9.73.0

Merged pull requests:

• add tutorial on disturbance modeling for state estimation (#3494) (@baggepinnen)
• Add getter for observed variables (#3558) (@hersle)
• fix: make remake type-stable (#3566) (@AayushSabharwal)
• Copy MTKParameters fields only if not empty (#3579) (@DhairyaLGandhi)

Closed issues:

• Type-unstable ODESolution object (#3560)

v9.73.0

ModelingToolkit v9.73.0

Diff since v9.72.0

Merged pull requests:

• MTKModel: Provision to specify the type of System (#3526) (@ven-k)
• [v10] feat: make @named always wrap arguments in ParentScope (#3533) (@AayushSabharwal)
• feat: improve type-inference of remake_buffer in certain cases (#3546) (@AayushSabharwal)
• fix: fix assert_jac_length_header (#3556) (@AayushSabharwal)
• fix: fix values being promoted to Float64 in problem construction (#3561) (@AayushSabharwal)
• test: update reference tests (#3562) (@AayushSabharwal)
• refactor: remove DelayParentScope (#3564) (@AayushSabharwal)
• refactor: remove time_varying_as_func (#3565) (@AayushSabharwal)
• test: test @named always wrapping in ParentScope (#3567) (@AayushSabharwal)
• fix: scalarize Initial parameters for split = false systems (#3569) (@AayushSabharwal)
• build: bump minor version (#3574) (@AayushSabharwal)

Closed issues:

• @mtkmodel macro for discrete-time systems (#3498)
• DelayParentScope variables aren't properly handled (#3539)
• Float32 types are automatically converted to Float64 (#3553)
• Small numeric error introduced in sparse jacobians (#3554)
• ERROR: LoadError: AssertionError: r == 0 in InitializationProblem creation (#3559)
• Warnings on 1.12 prerelease (#3568)

v9.72.0

ModelingToolkit v9.72.0

Diff since v9.71.0

Merged pull requests:

• docs: Document DAEProblem constructor (#3495) (@vyudu)
• feat: add substitute_component (#3502) (@AayushSabharwal)
• fix: don't substitute inside Initial in build_operating_point! (#3525) (@AayushSabharwal)
• fix: fix incorrect namespacing of DelayParentScope variables in collect_scoped_vars! (#3528) (@AayushSabharwal)
• feat: add cost and coalesce to ODESystem (#3531) (@vyudu)
• feat: compute jac_prototype for SDEFunction (#3535) (@vyudu)
• fix: don't call eval'd XFunctions in the tests (#3541) (@vyudu)
• build: bump minor version (#3550) (@AayushSabharwal)

Closed issues:

• MTK compatbility with BifurcationKit.jl (#3120)
• Control over autodiff in linearization (#3351)
• Document DAEProblem constructor and give a warning about performance implications (#3485)
• How to avoid Did not converge after maxiters = 1000 substitutions. warnings? (#3523)
• No jacobian prototype for sparse jacobian SDEProblems? (#3527)
• Sparse jacobians not working (#3529)
• public observed equivalent (#3536)

v9.71.0

ModelingToolkit v9.71.0

Diff since v9.70.0

Merged pull requests:

• Add documentation contribution of multi/nonlocal stability by Attractors.jl (#3512) (@Datseris)
• feat: enable CSE in build_function_wrapper (#3514) (@AayushSabharwal)
• test: make homotopy continuation test more robust (#3517) (@AayushSabharwal)
• feat: add latexify recipe for AnalysisPoint (#3519) (@AayushSabharwal)
• refactor: don't mark array variables as irreducible in TearingState (#3522) (@AayushSabharwal)
• fix: update initials with non-symbolic u0 in remake (#3530) (@AayushSabharwal)

Closed issues:

• Remake does not respect initial conditions of unknowns determined by initialization equations (#2841)
• remake for SDEProblem resets and ignores u0 (#3504)
• structural_simplify elimiantes differently for ODESystem and NonlinearSystems (#3521)

v9.70.0

ModelingToolkit v9.70.0

Diff since v9.69.0

Merged pull requests:

• feat: throw error when differentiating registered function with no derivative in structural_simplify (#3419) (@AayushSabharwal)
• feat: allow toggling namespacing independently of complete (#3497) (@AayushSabharwal)
• Fix depwarn due to wrapping Vararg directly in UnionAll (#3506) (@SebastianM-C)
• Improve consistency and add parameter dependencies to system printing (#3510) (@hersle)
• build: bump minor version (#3520) (@AayushSabharwal)

Closed issues:

• no method matching hasmetadata in tearing (#3370)
• Substituting a constant = 1 seems to mutate variable type of certain types of parameters (#3487)

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)