v8.18.0

ModelingToolkit v8.18.0

Diff since v8.17.0

Closed issues:

• Integrator doesn't support symbolic indexing (#1470)

Merged pull requests:

• Func affect (#1673) (@dodoplus)
• Add jump dependency graph test (#1699) (@isaacsas)

v8.17.0

ModelingToolkit v8.17.0

Diff since v8.16.0

Closed issues:

• Non-existent variable missing from variable map (#1628)
• varmap_to_vars fails when used inside of loss function for optimization. (#1692)
• ODEFunction is type-unstable (#1697)

Merged pull requests:

• Girsanov transformation for variance reduction of expected values (#1439) (@frankschae)
• Better tearing lowering (including implicit DAE to semi-implicit ODE transform) (#1650) (@YingboMa)
• Strong alias elimination and semi-implicit ODE lowering (#1685) (@YingboMa)
• add description metadata to variables (#1688) (@baggepinnen)
• Fix typo (#1696) (@bowenszhu)
• Discuss using MTK in loss functions in the FAQ (#1698) (@ChrisRackauckas)

v8.16.0

ModelingToolkit v8.16.0

Diff since v8.15.2

Merged pull requests:

• refactor simplification and generate_control_function (#1680) (@baggepinnen)
• Use new dependent array variable convention (#1681) (@shashi)
• Fix export warning (#1686) (@YingboMa)
• Always use reshape to prevent misformat (#1687) (@YingboMa)
• Clarify usage intent of tunable metadata (#1689) (@baggepinnen)
• Fix dimension mismatch and wrong equation in linearize (#1691) (@baggepinnen)
• Backwards compatibility for calling convention (#1694) (@shashi)

v8.15.2

ModelingToolkit v8.15.2

Diff since v8.15.1

Closed issues:

• Handling of null differential equations (#1654)
• connect doesn't support units? (#1655)

Merged pull requests:

• WIP: Add linearize function (#1675) (@YingboMa)
• add option to access state bounds (#1679) (@baggepinnen)
• Throw a more concrete error on unsupported modelingtoolkitize parameters (#1682) (@ChrisRackauckas)

v8.15.1

ModelingToolkit v8.15.1

Diff since v8.15.0

Merged pull requests:

• Revert "Strengthen alias elimination" (#1677) (@YingboMa)

v8.15.0

ModelingToolkit v8.15.0

Diff since v8.14.1

Closed issues:

• ModelingToolkit.unwrap() dropped? (#1651)
• Updating packages changed the system efficiency (#1664)

Merged pull requests:

• Strengthen alias elimination (#1635) (@Keno)
• Add pretty-printing for BipartiteGraph (#1657) (@Keno)
• Constraints and expression handling in OptimizationProblem (#1660) (@Vaibhavdixit02)
• Cleanup callbacks (#1661) (@isaacsas)
• upper bound Symbolics to 4.7.0 (#1662) (@shashi)
• Add observed equation to SDEfunction (#1665) (@frankschae)
• remove ControlSystem (#1667) (@ChrisRackauckas)
• Revert "upper bound Symbolics to 4.7.0" (#1669) (@shashi)
• Support parameter dict in modelingtoolkitize (#1671) (@YingboMa)
• Remove Requires.jl usage (#1672) (@ChrisRackauckas)
• Rename DiffEqJump to JumpProcesses (#1674) (@isaacsas)

v8.14.1

ModelingToolkit v8.14.1

Diff since v8.14.0

Closed issues:

• @variable docstring mentions Operation (#730)
• Solving ODEProblem fails with LinearAlgebra.SingularException, but only when jac=true, sparse=true (#1517)
• System of ODE defined using ModelingToolkit, not getting results, ODESystem defined properly? (#1614)
• Optimization Example doesn't work (#1620)
• Error thrown when renaming SDESystems (#1644)
• Units annotations don't "understand" derivatives (#1652)

Merged pull requests:

• Update for GalacticOptim.jl -> Optimization.jl change (#1627) (@ChrisRackauckas)
• Fix typo (#1629) (@ChrisRackauckas)
• Add a picture of the RC circuit. (#1630) (@ChrisRackauckas)
• Also treat selected states as unassigned edges in matching graph (#1632) (@Keno)
• AbstractTrees v0.4 compat (#1639) (@oscardssmith)
• Bump minimum DiffEqBase requirement (#1640) (@chriselrod)
• fix kwarg expressions (#1641) (@chriselrod)
• removed SDESystem rename function (#1645) (@jedforrest)
• detect input variables after conversion to parameters (#1647) (@baggepinnen)
• Reduce allocations (#1653) (@YingboMa)
• Update Downstream.yml (#1656) (@MartinuzziFrancesco)

v8.14.0

ModelingToolkit v8.14.0

Diff since v8.13.3

Merged pull requests:

• Better error message (#1622) (@YingboMa)
• Remove macro linnums in readable_code (#1623) (@YingboMa)
• Add irreducible property for variables (#1624) (@YingboMa)

v8.13.3

ModelingToolkit v8.13.3

Diff since v8.13.2

Closed issues:

• Modeling Optimization Problems Tutorial error (#1619)

Merged pull requests:

• Separate out pages (#1621) (@ChrisRackauckas)

v8.13.2

ModelingToolkit v8.13.2

Diff since v8.13.1

Closed issues:

• Support for observed variables in DAEFunction (#1436)

Merged pull requests:

• adds observedfun for DAEFunction (#1616) (@ValentinKaisermayer)
• Fix broken link and typo docstring (#1617) (@ArnoStrouwen)