v9.11.0

ModelingToolkit v9.11.0

Diff since v9.10.0

Merged pull requests:

• fix: propagate parameter dependencies in extend (#2629) (@SebastianM-C)
• fix: fix intialization of array parameters with unknown size (#2630) (@AayushSabharwal)
• feat: allow creating NonlinearSystem without specifying unknowns/parameters (#2631) (@AayushSabharwal)
• feat: support parameter dependencies for NonlinearSystem (#2632) (@AayushSabharwal)

Closed issues:

• Weird behaviour when declaring a paraemter as a vector (#2615)
• Cannot create NonlinearSystems with only equation input (like for ODESystems) (#2625)
• Remaking ODEProblem fails inside of Turing model (#2634)

v9.10.0

ModelingToolkit v9.10.0

Diff since v9.9.0

Merged pull requests:

• refactor: use the t defined in the module (#2569) (@ven-k)
• Handle derivatives of observed variables (#2574) (@ChrisRackauckas)
• fix: fix hierarchical discrete systems (#2593) (@AayushSabharwal)
• fix: fix namespacing of defaults and equations (#2594) (@AayushSabharwal)
• Revert "fix: fix namespacing of defaults and equations" (#2595) (@ChrisRackauckas)
• Change wording from initial guess to initial condition (#2598) (@baggepinnen)
• docs: add tutorial for optimizing ODE solve and remake (#2600) (@AayushSabharwal)
• Accessors for differential and algebraic erquations (#2601) (@TorkelE)
• Support docstrings for @connectors and @components (#2602) (@devmotion)
• fix: fix callback codegen, observed eqs with non-scalarized symbolic arrays (#2605) (@AayushSabharwal)
• refactor: improve replace, remake_buffer (#2610) (@AayushSabharwal)
• feat: improve error messages for missing variables and subsystems (#2617) (@AayushSabharwal)
• Revert "feat: improve error messages for missing variables and subsystems" (#2620) (@YingboMa)
• Revert "feat: improve error messages for missing variables and subsystems" (#2622) (@ChrisRackauckas)
• Fix a minor issue in generate_initializesystem (#2627) (@YingboMa)

Closed issues:

• Indexing and dot-assignment of parameters/variables in nested systems (#892)
• Identity matrix multiplied by z[3:4] gives z[1:2] (#1099)
• Missing heuristic for array variables (#1283)
• Problem when defining Vector variables in connectors (#1432)
• Default initial conditions trigger an error when composing connections using scalarize() (#1553)
• "Axes of broadcast not known" with differential matrix equation (#1740)
• Error when taking inverse of matrix parameters, missing * method (#2134)
• continuous_events fails to recognize vectors (#2383)
• Error in alias elimination of DiscreteSystem (#2585)
• Cannot use micro moles units. (#2590)
• guess not used (#2596)
• Callback function generation error (#2599)

v9.9.0

ModelingToolkit v9.9.0

Diff since v9.8.0

Merged pull requests:

• Fix _varmap_to_vars, re-enable dde.jl test (#2545) (@MasonProtter)
• Document and export continuous_events and discrete_events (#2567) (@MasonProtter)
• feat: implement SII.remake_buffer for MTKParameters, fix bugs, add tests (#2570) (@AayushSabharwal)
• Empty events should be empty (#2582) (@YingboMa)
• fix: fix varmap_to_vars for variables with unspecified size (#2586) (@AayushSabharwal)
• Fix tearing_reassemble for under-determined systems (#2587) (@YingboMa)
• refactor: remove undefined export initializesystem (#2588) (@sathvikbhagavan)

Closed issues:

• structural_simplify does not seem to include dae_index_lowering anymore (#2417)
• Re-add DiscreteSystem (#2461)
• Dropped unknowns with non-fully determined structural simplifications (#2515)
• MTK 9 fails to simplify u0map with DDEProblem (#2543)
• Error with MTKParameters and Dual Numbers (#2571)

v9.8.0

ModelingToolkit v9.8.0

Diff since v9.7.1

Merged pull requests:

• fix: do not filter array unknowns in wrap_array_vars (#2549) (@AayushSabharwal)
• initialization bypass (#2572) (@ChrisRackauckas)
• test: add MTKParameters tests, fix bugs (#2581) (@AayushSabharwal)

v9.7.1

ModelingToolkit v9.7.1

Diff since v9.7.0

Merged pull requests:

• fix: fix initialization and observed bugs (#2575) (@AayushSabharwal)

Closed issues:

• ODEProblem get stuck (when creating MTKProblem) for certain ODE inputs (where parameter have defaults depending on initial conditions) (#2565)
• ModelingToolkit.varmap_to_vars throws error when input have default value depending on paraemters or initial conditions (#2566)

v9.7.0

ModelingToolkit v9.7.0

Diff since v9.6.1

Merged pull requests:

• feat: initial implementation of new DiscreteSystem (#2507) (@AayushSabharwal)
• Update DynamicQuantities compatibility (#2562) (@TorkelE)
• feat: allow parameter defaults to depend on initial values of unknowns (#2563) (@AayushSabharwal)
• fix: fix creation of JumpProblems with no parameters (#2564) (@AayushSabharwal)

Closed issues:

• Parameters with default values that depend on variables' initial conditions no longer supported (#2556)
• Cannot call @mtkbuild on JumpSystem creation (#2558)
• Cannot create JumpProblems for systems without parameters (#2559)

v9.6.1

ModelingToolkit v9.6.1

Diff since v9.6.0

Merged pull requests:

• fix: fix io handling in structural_simplify, input_output_handling tests (#2547) (@AayushSabharwal)
• Fix iteration bounds in tearing_with_dummy_derivatives (#2557) (@YingboMa)
• Update for StructuralIdentifiability API changes (#2561) (@ChrisRackauckas)

Closed issues:

• MethodError Raised When Running "Parameter Identifiability in ODE Models" Tutorial (#2551)

v9.6.0

ModelingToolkit v9.6.0

Diff since v9.5.0

Merged pull requests:

• add docs for sampled-data systems (#2410) (@baggepinnen)
• Add getindex/setindex! methods for MTKParameters with ParameterIndex (#2531) (@MasonProtter)
• Avoid computing inputs if IO is unspecified (#2537) (@baggepinnen)
• fix: fix history function in DDEProblem constructor (#2541) (@AayushSabharwal)
• docs: update FAQ section with relevant MTKv9 questions (#2542) (@AayushSabharwal)
• refactor: implement new additions to SII interface (#2544) (@AayushSabharwal)
• Add missing updates to sampled-data docs (#2560) (@baggepinnen)

Closed issues:

• varmap_to_vars output and MTKParameters in ODEProblem are Different (#2525)
• Problem with DDEProblem and MTK 9 (#2530)
• Error Accessing Parameter Argument of Integrator during continuous_events Callback (#2538)
• guess is sometimes ignored (here with linearize) (#2539)
• Create a function for retrieving the default t iv? (#2552)

v9.5.0

ModelingToolkit v9.5.0

Diff since v9.4.0

Merged pull requests:

• Add event support mtkmodel (#2427) (@cgutsche)
• Specialize symbolic Struct (#2532) (@YingboMa)

Closed issues:

• Discrete Events Behaving Unexpectedly (#2528)

v9.4.0

ModelingToolkit v9.4.0

Diff since v9.3.0

Merged pull requests:

• Add support for component array in @mtkmodel (#2368) (@ven-k)
• feat: add @defaults to @mtkmodel (#2437) (@ven-k)
• Fix updating default value metadata of conditional parameters (#2438) (@ven-k)
• chore: add 0.12 of DynamicQuantities (#2479) (@ven-k)
• CompatHelper: bump compat for DynamicQuantities to 0.12 for package docs, (keep existing compat) (#2498) (@github-actions[bot])
• Parse constants in @mtkmodel (#2499) (@ven-k)
• fix: fix variable_index (#2514) (@AayushSabharwal)
• feat: add SolverStepClock (#2517) (@baggepinnen)
• fix: type of array in the mtkmodel's f (#2521) (@ven-k)
• [skip ci] add isconnection to ignored typos words (#2523) (@ArnoStrouwen)
• fix: avoid scalarizing params in structural_simplify, variable defaults in get_u0 (#2524) (@AayushSabharwal)

Closed issues:

• Move @variables and @parameters defaults to the ODESystem defaults keyword to support defaults that depend on components. Or add a @defaults block to support out of order defaults manually. (#2416)
• "Ignore" option for connectors (#2422)
• Callback Example gives MethodError with MTK 9 (#2496)