v9.34.0

ModelingToolkit v9.34.0

Diff since v9.33.1

Merged pull requests:

• Add support for symbolic units by normalizing them to SI units (#2621) (@YingboMa)
• refactor: store discrete portion in BlockedArray for efficiency, better handle event variables (#2945) (@AayushSabharwal)
• Expose independent variable as a system property (#2962) (@hersle)
• Hotfix to avoid DataFrames.jl piracy (#2966) (@MasonProtter)
• AD: Add ChainRules extension for MTKParameters construction (#2977) (@DhairyaLGandhi)
• Fix parameter dependencies across model hierarchy (#2978) (@SebastianM-C)
• CompatHelper: add new compat entry for ChainRulesCore in [weakdeps] at version 1, (keep existing compat) (#2980) (@github-actions[bot])
• refactor: default to use_union = false for ODEProblems (#2983) (@AayushSabharwal)
• fix: discover parameters from parameter dependencies, fix substitute (#2984) (@AayushSabharwal)
• make LabelledArrays an extension (#2985) (@SebastianM-C)
• Update MTKLabelledArraysExt.jl (#2987) (@ChrisRackauckas)
• Fix depwarns from solve_for (#2993) (@SebastianM-C)

Closed issues:

• Support scaled SI units (#2616)
• Type piracy by DataFrames.jl causes error during SDE simplification (#2965)
• ODEProblem from ODESystem does not sub nested constants (#2969)
• Memory and Performance Problem (#2971)

v9.33.1

ModelingToolkit v9.33.1

Diff since v9.33.0

Merged pull requests:

• feat: document and expose MTKParameters as public API (#2955) (@AayushSabharwal)
• Fix an exception during documentation build (#2957) (@contradict)
• kwarg to disable unit checking in InitializationProblem (#2960) (@aml5600)
• sub constants in generate_function (#2970) (@aml5600)
• fix: fix several bugs, get MTK to precompile (#2973) (@AayushSabharwal)

Closed issues:

• provide exported function for generating MTKParameters from user parameter maps (#2954)
• Vector ODE duplicating length of intial condition and not shifting equation to observed (#2964)
• MTK doesn't precompile after latest update (#2972)

v9.33.0

ModelingToolkit v9.33.0

Diff since v9.32.0

Merged pull requests:

• refactor: remove parameter dependencies from MTKParameters (#2934) (@AayushSabharwal)
• Symbolics / SymbolicUtils / TermInterface bump (#2948) (@ChrisRackauckas)
• Fix docs build (#2956) (@contradict)

Closed issues:

• MTK & Symbolic linearization -- why 2 inputs when I specify 1 input? (#2951)
• u0_constructor for SDEProblem (#2958)

v9.32.0

ModelingToolkit v9.32.0

Diff since v9.31.0

Merged pull requests:

• support JumpProblems over ODEProblems (#2946) (@isaacsas)

v9.31.0

ModelingToolkit v9.31.0

Diff since v9.30.1

Merged pull requests:

• fix: fix initialization with defaults dependent on indepvar (#2820) (@AayushSabharwal)
• add an example to IO docs (#2926) (@baggepinnen)
• fix: fix replace with array dependent parameters (#2933) (@AayushSabharwal)
• Flatten for complex (#2935) (@contradict)
• Disallow duplicate names (#2938) (@contradict)
• normalize operating point user input (#2939) (@baggepinnen)
• fix: fix vectorization of array variables with inputs (#2940) (@AayushSabharwal)
• Fix Latex tests to use new upstream equation equality aligning (#2942) (@hersle)
• Add DummyDerivativeSummary debuginfo (#2943) (@YingboMa)
• Experimental variable filtering in dummy derivative (#2944) (@YingboMa)

Closed issues:

• Cannot (re)make problems with defaults involving the independent parameter (#2799)
• Possible to create system where a parameter and variable have the same name (#2883)
• Missing whitespace in documentation equations (#2894)
• Cannot use Complex equation in @mtkmodel (#2895)
• Warning: Internal error (#2920)
• Replacing tunables of dependent parameter vector fails (#2932)

v9.30.1

ModelingToolkit v9.30.1

Diff since v9.30.0

Merged pull requests:

• Make default value units consistent (#2898) (@contradict)
• Fix README example (#2930) (@hersle)
• update JumpSystem for auto-alg support (#2931) (@isaacsas)
• Add documentation for irreducible metadata (#2936) (@contradict)
• Extend state priority to all its derivative chains in DD (#2937) (@YingboMa)

Closed issues:

• High Level example 2 error: ExtraVariablesSystemException: The system is unbalanced (#2925)

v9.30.0

ModelingToolkit v9.30.0

Diff since v9.29.0

Merged pull requests:

• Support more of the SciMLBase events API (#2911) (@BenChung)
• rewrite optimization tutorial (#2916) (@ArnoStrouwen)
• fix some cosmetics in docs (#2921) (@baggepinnen)
• fix: fix downstream indexing tests (#2927) (@AayushSabharwal)

Closed issues:

• Event trigger directionality (#1715)
• No documented way to set rootfind=RightRootFind in continuous Event. (#2351)

v9.29.0

ModelingToolkit v9.29.0

Diff since v9.28.0

Merged pull requests:

• ci: standardise workflows using SciML's reusable workflows (#2695) (@thazhemadam)
• Getting started doc rewrite (#2903) (@ArnoStrouwen)
• refactor: turn tunables portion into a Vector{T} (#2908) (@AayushSabharwal)
• Delete mo.diff (#2913) (@ChrisRackauckas)
• Detect cases where there's fewer brownians than equations, but noise still 'diagonal' (#2914) (@MasonProtter)
• rewrite nonlinear solve tutorial (#2915) (@ArnoStrouwen)
• add docs for input-output handling (#2918) (@baggepinnen)

Closed issues:

• Fix broken indexing tests (#2696)

v9.28.0

ModelingToolkit v9.28.0

Diff since v9.27.0

Merged pull requests:

• fix: fix some linearization bugs (#2912) (@AayushSabharwal)

Closed issues:

• undefvar and bounds error in linearization_function (#2907)

v9.27.0

ModelingToolkit v9.27.0

Diff since v9.26.0

Merged pull requests:

• feat: implement new discrete saving functionality (#2728) (@AayushSabharwal)
• Add tests of various features (#2806) (@TorkelE)
• fix: allow vector defaults in @mtkmodel (#2830) (@ven-k)
• fix: fix edge cases with metadata dumping, add tests (#2836) (@AayushSabharwal)
• Rename @mtkmodel... docs and add a section describing @mtkbuild (#2890) (@ven-k)
• fix: fix remaking scalarized array parameters with non-scalarized symbolic map (#2897) (@AayushSabharwal)
• CompatHelper: bump compat for SymbolicUtils to 3 for package docs, (keep existing compat) (#2901) (@github-actions[bot])
• Use subs_constants in generate_control_function (#2904) (@aml5600)

Closed issues:

• remake fails with ERROR: ArgumentError: ... is neither an observed nor an unknown variable. (#2757)
• Cannot provide vector parameter values to remake for scalarised system (#2804)
• Cannot provide default value for array parameter (#2810)
• Cannot simulate SDEs with static array parameters/initial conditions (#2851)
• Array-valued parameters are not interpreted correctly when creating ODESystem (#2876)
• @constants not defined in generate_control_function output (#2896)