v8.5.2

ModelingToolkit v8.5.2

Diff since v8.5.1

Closed issues:

• warning about both MT and Symbolics exporting infimum/supremum (#1217)
• Error on indixing into solution by Num (#1448)
• Acausal Modelling Changes in MTK: Error on ground element (Electrical) (#1460)
• Invalid redefinition of constant lambda or other variable name (#1466)
• Some problem with bipartite_graph.jl in ModelingToolkit (#1471)
• Crash of standard AkzoNobel demo (#1472)
• ODEFunctonExpr(sys, sparse=true) Fails to generate sparse matrix or recognize identity (#1476)

Merged pull requests:

• add tests for bareiss, fix precompile (#1455) (@oscardssmith)
• docs: fix a few typos (#1467) (@visr)
• eltype promotion in varmap_tp_vars (#1469) (@baggepinnen)
• fix flow over >2 connectors with arrays (#1473) (@visr)
• CompatHelper: bump compat for ArrayInterface to 5, (keep existing compat) (#1474) (@github-actions[bot])
• Check against Identity with equality (#1477) (@xtalax)
• Invalidate system cache (#1479) (@ChrisRackauckas)

v8.5.1

ModelingToolkit v8.5.1

Diff since v8.5.0

Merged pull requests:

• Fix sparse jacobian from TearingState (#1465) (@YingboMa)

v8.5.0

ModelingToolkit v8.5.0

Diff since v8.4.1

Closed issues:

• Add support to variables with custom type (#1194)
• Cannot use a set of equations in ODESystem with variables that are vectors (#1196)
• Cannot add restriction to ODE system when using variables that are vectors (#1203)
• Julia crashes when trying to evaluate ODEFunction of large MTK structure (#1452)
• Wrong initial conditions when creating the ODEProblem (#1458)

Merged pull requests:

• Default allow_symbolic to true (#1451) (@YingboMa)
• CompatHelper: bump compat for NaNMath to 1, (keep existing compat) (#1457) (@github-actions[bot])
• Vectorize pdeeqs (#1462) (@xtalax)
• add observed to JumpProblems (#1463) (@isaacsas)

v8.4.1

ModelingToolkit v8.4.1

Diff since v8.4.0

Closed issues:

• Poor UTF input dictionary in the formulation of symbolic models (#1446)
• Segfaults while building sysimage(s) with MTK v8.4.0 (#1453)

Merged pull requests:

• move bareiss (#1449) (@oscardssmith)
• remove compat incremental_cycles (#1450) (@oscardssmith)
• Rollback #1215 as it causes package compilation to fail (#1454) (@sharanry)

v8.4.0

ModelingToolkit v8.4.0

Diff since v8.3.2

Closed issues:

• Unexplained behavior from structural_simplify (#1317)
• Dependent source in circuit (#1430)
• docs: Simulink listed among the equation-based modeling languages (#1431)
• NonlinearSystem fails with connection equations since v8 (#1442)

Merged pull requests:

• start trying to precompile ModelingToolkit better (#1215) (@ChrisRackauckas)
• Identifiability tutorial (#1243) (@iliailmer)
• Partial State Selection (#1384) (@Keno)
• CompatHelper: bump compat for JuliaFormatter to 0.22, (keep existing compat) (#1437) (@github-actions[bot])
• Fix typos in Identifiability Tutorial (#1443) (@iliailmer)
• Add connections to NonlinearSystem (#1445) (@tred0)

v8.3.2

ModelingToolkit v8.3.2

Diff since v8.3.1

Closed issues:

• Simplify doesn't recognize a zero (#1392)
• Akzo Nobel DAEProblem fails after recent MTK update (#1428)

Merged pull requests:

• Add preface for DiscreteSystem (#1429) (@sharanry)

v8.3.1

ModelingToolkit v8.3.1

Diff since v8.3.0

Closed issues:

• "LoadError: ArgumentError: reducing over an empty collection is not allowed" when trying to solve Newton's 2nd Law (#1426)

Merged pull requests:

• Handle the trivial case of dependency chasing (#1427) (@YingboMa)

v8.3.0

ModelingToolkit v8.3.0

Diff since v8.2.0

Closed issues:

• ODEProblem doesn't check the validity of the system (#1389)
• Using symbolic arrays with NonlinearSystem gives a method error (#1406)
• ODAESystem generate_function is wrong (#1413)
• Silent error in unlowered ODE (#1417)

Merged pull requests:

• Optimized lowering of torn systems (#1414) (@YingboMa)
• Fix #1413 and #1389; check the validity of the equations before building the function (#1425) (@YingboMa)

v8.2.0

ModelingToolkit v8.2.0

Diff since v8.1.0

Merged pull requests:

• If sparse, make the mass matrix sparse (#1423) (@ChrisRackauckas)
• Bump DiffEqBase to force fix of downstream (#1424) (@ChrisRackauckas)

v8.1.0

ModelingToolkit v8.1.0

Diff since v8.0.0

Closed issues:

• MTK PDE solve crashes Julia (#1420)

Merged pull requests:

• Use newer keyword arg syntax (#1412) (@rikhuijzer)
• CompatHelper: bump compat for JuliaFormatter to 0.21, (keep existing compat) (#1416) (@github-actions[bot])
• Fix typos (#1419) (@helgee)
• CompatHelper: bump compat for ArrayInterface to 4, (keep existing compat) (#1421) (@github-actions[bot])