v9.0.0

ModelingToolkit v9.0.0

Diff since v8.75.0

Merged pull requests:

• [BREAKING Don't merge] Support DynamicQuantities (#2349) (@YingboMa)
• add component-based hybrid system test (#2355) (@baggepinnen)
• Getcoeffchunk (#2393) (@chriselrod)
• Preserve staticarrays in the problem construction (#2399) (@ChrisRackauckas)
• Fix some warnings (#2405) (@isaacsas)
• build(deps): bump crate-ci/typos from 1.16.25 to 1.17.0 (#2419) (@dependabot[bot])
• CompatHelper: bump compat for DynamicQuantities to 0.11, (keep existing compat) (#2424) (@github-actions[bot])
• Replace MacroTools with ExprTools & Base.remove_lines! (#2425) (@oxinabox)
• Consistent variable creation (#2428) (@YingboMa)
• build(deps): bump actions/cache from 3 to 4 (#2430) (@dependabot[bot])
• fix(pdesystem): parameters are vector of Num instead of vector of pairs when analytic is also passed (#2431) (@sathvikbhagavan)
• refactor: rename states to unknowns, and related changes (#2432) (@AayushSabharwal)
• feat!: deprecate ODAEProblem (#2435) (@AayushSabharwal)
• refactor!: require systems to be completed before creating XProblem/XProblemExpr (#2436) (@AayushSabharwal)
• test: uncomment tests (#2439) (@AayushSabharwal)
• refactor!: remove old discrete system (#2440) (@AayushSabharwal)
• feat!: add common definitions of t and D (#2442) (@AayushSabharwal)
• fix!: require explicit independent variable for ODESystem (#2443) (@AayushSabharwal)
• Update bifurcation_diagram_computation.md (#2444) (@rveltz)
• Update bifurcation_diagram_computation.md, add periodic orbits comput… (#2445) (@rveltz)
• chore: remove undefined exports (#2446) (@sathvikbhagavan)
• feat!: use SciMLStructures and add new MTKParameters (#2447) (@AayushSabharwal)
• build(deps): bump codecov/codecov-action from 3 to 4 (#2448) (@dependabot[bot])
• build(deps): bump crate-ci/typos from 1.17.0 to 1.18.0 (#2449) (@dependabot[bot])
• Have CI tests depend on formatter passing (#2451) (@chriselrod)
• [skip ci] Update dependabot.yml (#2452) (@ArnoStrouwen)
• ci: explicitly specify token for codecov (#2454) (@thazhemadam)
• Pin JuliaFormatter (#2456) (@YingboMa)
• docs: use @mtkbuild instead of manually calling complete (#2460) (@AayushSabharwal)
• Fix test groupings and test setup (#2465) (@ChrisRackauckas)
• docs: update NEWS.md with v9 update notes (#2466) (@AayushSabharwal)
• build: bump compat of DomainSets (#2467) (@sathvikbhagavan)
• Correct number of srcs in complete (#2468) (@Keno)
• feat!: do not scalarize parameters, fix some tests (#2469) (@AayushSabharwal)
• Format (#2471) (@YingboMa)
• docs: update NEWS.md (#2473) (@AayushSabharwal)

Closed issues:

• ODESystem created calling external vector valued function (#1828)
• Missing initialization of discrete-to-continuous communication parameter (#2356)
• ModelingToolkit does not save array as static arrays (for initial conditions and parameter values) (#2398)
• Internation functions for conversion between various forms of representing states/parameters etc. (e.g. symbolics or indexes) (#2404)
• Cannot access observed variables in NonlinearSolution (#2420)
• Precompilation of ModelingToolkit reports two errors on Julia 1.10 (#2429)
• Basic (but incomplete) system construction throws incorrect error on get_system (#2464)
• structural_simplify of SDESystem (#2476)

v8.75.0

ModelingToolkit v8.75.0

Diff since v8.74.1

Merged pull requests:

• CompatHelper: bump compat for StructuralIdentifiability to 0.5 for package docs, (keep existing compat) (#2365) (@github-actions[bot])
• CompatHelper: bump compat for NonlinearSolve to 3 for package docs, (keep existing compat) (#2376) (@github-actions[bot])
• fix: remove evals from model parsing (#2379) (@ven-k)
• feat: add new all-symbols methods from SII (#2386) (@AayushSabharwal)
• refactor: handle NullParameters, fix independent_variable_symbols for multivariate systems (#2391) (@AayushSabharwal)
• @inbounds @boundscheck does not work; should have tested it earlier. (#2392) (@chriselrod)
• Update abstractsystem.jl with :get_name (#2395) (@cadojo)

Closed issues:

• Broadcast inside of @mtkmodel macro causes precompilation failures when put into a package (#2377)
• Load error with @mtkbuild (#2390)
• Support remake to update individual variables/species in new MTK version (#2396)
• Erroe when plotting observed variable(s) (#2397)

v8.74.1

ModelingToolkit v8.74.1

Diff since v8.74.0

Merged pull requests:

• Cache hash of ConnectionElement (#2384) (@chriselrod)
• build(deps): bump crate-ci/typos from 1.16.24 to 1.16.25 (#2387) (@dependabot[bot])
• Split test groups (#2388) (@ChrisRackauckas)
• [skip ci] dependabot ignore typos patches (#2389) (@ArnoStrouwen)

v8.74.0

ModelingToolkit v8.74.0

Diff since v8.73.2

Merged pull requests:

• Keep symbolic expressions as is and minor bugfixes optimization system (#2323) (@Vaibhavdixit02)
• feat: support components with fully-qualified names with @mtkmodel (#2330) (@thazhemadam)
• feat: implementation of new SymbolicIndexingInterface (#2345) (@AayushSabharwal)
• build(deps): bump crate-ci/typos from 1.16.23 to 1.16.24 (#2378) (@dependabot[bot])
• Custom initial condition equations for an ODESystem (#2382) (@MarcBerliner)

Closed issues:

• Supplying value of parameter as initial state is silently ignored (#1299)
• @mtkmodel errors when module qualifier is used to create component (#2289)
• Fail to precompile (#2375)

v8.73.2

ModelingToolkit v8.73.2

Diff since v8.73.1

Merged pull requests:

• Support conditional statements in @mtkmodel (#2319) (@ven-k)
• Handle dummy derivatives in linearization_function (#2361) (@baggepinnen)
• typos CI (#2363) (@ArnoStrouwen)
• build(deps): bump actions/checkout from 3 to 4 (#2367) (@dependabot[bot])
• CompatHelper: bump compat for SimpleNonlinearSolve to 1, (keep existing compat) (#2370) (@github-actions[bot])
• fix: canonicalize all positional args in @named (#2373) (@ven-k)

Closed issues:

• dae_index_lowering fails to find solution when [input=true] variables are connected (#1298)
• structural_simplify removes subsystems (#1309)
• Input semantics concrete prototype (#1311)
• Failure to propagate default parameter value to inner system (#2294)
• ODE update function generated using symbolics much slower than naive user implementation? (#2372)

v8.73.1

ModelingToolkit v8.73.1

Diff since v8.73.0

Merged pull requests:

• Bump compat of Symbolics (#2357) (@sathvikbhagavan)

v8.73.0

ModelingToolkit v8.73.0

Diff since v8.72.2

Merged pull requests:

• Support symbolic arrays in @mtkmodel (#2282) (@ven-k)
• non canon docstrings (#2315) (@ArnoStrouwen)
• allow multibody frame connectors to be unbalanced (#2316) (@baggepinnen)
• allow scalar IO in linearize (#2317) (@baggepinnen)
• BifurcationKit Extension (take 2) (#2321) (@TorkelE)
• docs: Fix Systems docstrings (#2324) (@sathvikbhagavan)
• build(docs): add BifurcationKit in Project.toml (#2325) (@sathvikbhagavan)
• Minor typo fix in Bifurcation tutorial (#2327) (@TorkelE)
• Drop Julia 1.6 (#2332) (@YingboMa)
• New formatter (#2333) (@YingboMa)
• handle parameters that only appear as defaults (#2336) (@baggepinnen)
• Improve BifurcationKit extension (#2337) (@TorkelE)
• Change typeof(x) <: y to x isa y (#2343) (@pepijndevos)
• Improves @icon and adds related docs (#2346) (@ven-k)
• Add compat entries for stdlibs (#2353) (@devmotion)

Closed issues:

• Making sure doc examples run (#1570)
• noncanonical docstring (#2297)
• Desciptive error for not passing parameters all the way down (#2320)
• Parameters that appears only as defaults are ignored (#2322)
• remake fails to set initial conditions based on parameters (#2329)

v8.72.2

ModelingToolkit v8.72.2

Diff since v8.72.1

Merged pull requests:

• update docs for new extension syntax (#2309) (@ChrisRackauckas)
• Simplify at extend (#2310) (@YingboMa)

Closed issues:

• Alias @named to @build to avoid confusion (#2263)
• @variables error with description and default value depending on parameters (#2298)

v8.72.1

ModelingToolkit v8.72.1

Diff since v8.72.0

Merged pull requests:

• Support implicit name unpack in at extend (#2306) (@YingboMa)
• one more tutorial simplification (#2307) (@ChrisRackauckas)

v8.72.0

ModelingToolkit v8.72.0

Diff since v8.71.2

Merged pull requests:

• Refactor docs with @mtkmodel (#2286) (@ven-k)
• Fix recursive structure and setup precompilation (#2301) (@ChrisRackauckas)
• Add @mtkbuild greatly simplify the tutorials (#2305) (@ChrisRackauckas)