v5.2.0

ModelingToolkit v5.2.0

Diff since v5.1.0

Merged pull requests:

• CompatHelper: bump compat for "ArrayInterface" to "3.0" (#756) (@github-actions[bot])

v5.1.0

ModelingToolkit v5.1.0

Diff since v5.0.1

Closed issues:

• Inversion of anti-symmetric matrix fails (#622)
• StackOverflow on trying to alias_eliminate equations with circular dependency (#724)
• Initial conditions and default parameters handling (#739)
• ERROR: MethodError: no method matching Diagonal(::Num) when modelingtoolkitizing a model that uses LinearAlgebra functions (#744)

Merged pull requests:

• Handle u0 with UnionAll eltype (#747) (@YingboMa)
• Introduce default_ps and default_u0 (#748) (@YingboMa)
• Add topsort and improved alias elimination (#750) (@YingboMa)
• Update symbolic_functions.md to make derivative example work (#752) (@GlenHertz)
• Typo with Modelingtoolkitize (#753) (@GlenHertz)
• Complete NonlinearSystem (#754) (@ChrisRackauckas)

v5.0.1

ModelingToolkit v5.0.1

Diff since v5.0.0

Merged pull requests:

• Fix duplicate method definition (#743) (@YingboMa)

v5.0.0

ModelingToolkit v5.0.0

Diff since v4.5.0

Closed issues:

• MethodError in qr() and pinv() for matrices with symbols (#464)
• BoundsError with DAE system when defining t as a variable instead of parameter (#609)
• Simplification of inverses (#615)
• Derivatives, chain rule, external dependencies (#619)
• Simplifying floating point exponents sometimes doesn't cancel terms (#630)
• Missing isone(::Num) method? (#653)
• What to do with derivative (#684)
• MethodError: no method matching lower_mapnames(::Array{Any,1}) when trying to pass distributions as parameters (#727)
• Differentiation Test: Test Failed at test/derivatives.jl:76 (#737)

Merged pull requests:

• WIP: upgrade to SymbolicUtils w/ fast terms (#720) (@YingboMa)
• automate latexify in notebooks (#726) (@ChrisRackauckas)
• don't require numbers for varmap lowering (#732) (@ChrisRackauckas)
• Re-enable latexify tests (#733) (@YingboMa)
• Add more methods on BipartiteGraph and add SystemStructure (#738) (@YingboMa)
• Deprecate @derivatives and better derivatives function (#740) (@YingboMa)
• Don't simplify by default (#742) (@YingboMa)

v4.5.0

ModelingToolkit v4.5.0

Diff since v4.4.3

Closed issues:

• Empty Equation array leads to incorrect type for connections function. Causes flatten to fail. (#716)
• Automatically add initial condition for the Liouville transformation term (#718)

Merged pull requests:

• drop internal use of Nums for assemble_diffusion (#715) (@isaacsas)
• add the liouville transformation (#717) (@ChrisRackauckas)
• Make sure equations returns Vector{Equation} (#719) (@YingboMa)

v4.4.3

ModelingToolkit v4.4.3

Diff since v4.4.2

Closed issues:

• AutoOptimize produces wrong results, ode_order_lowering produces defect model, StructuralTransformations.dae_index_lowering fails (#708)

Merged pull requests:

• Fix conversion of reactionsys to nonlinsys (#710) (@isaacsas)
• Fix order lowering (#714) (@YingboMa)

v4.4.2

ModelingToolkit v4.4.2

Diff since v4.4.1

Merged pull requests:

• Register set operations (#706) (@dpsanders)
• Fix Laplace expansion to compute det for 1x1 mat (#712) (@ArnoStrouwen)
• allow tuples in varmaps (#713) (@ChrisRackauckas)

v4.4.1

ModelingToolkit v4.4.1

Diff since v4.4.0

Merged pull requests:

• fix DiscreteProblem varmap usage (#709) (@isaacsas)

v4.4.0

ModelingToolkit v4.4.0

Diff since v4.3.4

Merged pull requests:

• handle tuples in varmap lowering (#704) (@ChrisRackauckas)
• Add Laplace expansion to compute det (#707) (@YingboMa)

v4.3.4

ModelingToolkit v4.3.4

Diff since v4.3.3

Closed issues:

• no method matching iterate(::Sym{ModelingToolkit.Parameter{Real}}) (#701)

Merged pull requests:

• Simplify type handling in non-concrete varmap (#702) (@ChrisRackauckas)
• Special case Sym in variable collection (#703) (@YingboMa)