v8.10.0

ModelingToolkit v8.10.0

Diff since v8.9.0

Closed issues:

• Feature Request: Option to define limits for parameters when using ModelingToolkit.jl (#1509)
• v8.9.0 breaks mixed types using varmap_to_vars (#1561)

Merged pull requests:

• add functions to handle inputs and outputs (#1322) (@baggepinnen)
• Optimization (#1554) (@YingboMa)
• Fix consistency checks (#1555) (@YingboMa)
• More robust error checking and better tests (#1556) (@YingboMa)
• optionally return col ordering in nullspace (#1558) (@isaacsas)
• Make sure that potential state variables are not eliminated by alias_elimination (#1559) (@YingboMa)
• add variable metadata (#1560) (@baggepinnen)
• Support array of arrays in varmap_to_vars (#1567) (@YingboMa)

v8.9.0

ModelingToolkit v8.9.0

Diff since v8.8.1

Closed issues:

• convert_system(ODESystem, sys, independent_variable(sys2) gives ArgumentError: Cannot find the parent of ... (#1281)
• sol[u] not working with NonlinearProblem (#1504)
• Optimization readme example not working (#1542)
• ExtraEquationsSystemException - worked in 8.5.5 - related to #1539 and #1537? (#1544)
• Acausal circuit example output doesn't match docs (#1545)
• Calculating nullspace after bareiss! (#1551)

Merged pull requests:

• isisomorphic and convert_system fix (#1543) (@anandijain)
• 📝 update docs for acausal circuit example (#1546) (@AnasAbdelR)
• Promote to concrete type by default if it's an array (#1548) (@YingboMa)
• Scalarize in observed function building (#1549) (@YingboMa)
• rm upstreamed dispatch (#1550) (@anandijain)
• Add nullspace computation (#1552) (@YingboMa)

v8.8.1

ModelingToolkit v8.8.1

Diff since v8.8.0

Closed issues:

• Can't register function from Interpolations (MWE) (#1354)
• Equations with IfElse.ifelse incorrectly removed (#1536)

Merged pull requests:

• Better instream expansion diagnostics and bug fix (#1541) (@YingboMa)

v8.8.0

ModelingToolkit v8.8.0

Diff since v8.7.1

Closed issues:

• The callback problem of modelingtoolkit (#1527)
• Error when solving a modelingtoolkitized system that uses StaticArrays (#1529)
• Question about the Cvode(cvode_mem, tout, y0, &t, CV_NORMAL) command (#1531)
• UndefVarError, the solution object can't be accessed by symbols again (#1533)

Merged pull requests:

• Add but_ordered_incidence (#1534) (@YingboMa)
• Give the ModelingToolkit Standard Library some space in the docs (#1535) (@ChrisRackauckas)
• Add allow_symbolic and allow_parameter as options in structural_simplify (#1538) (@YingboMa)

v8.7.1

ModelingToolkit v8.7.1

Diff since v8.7.0

Closed issues:

• SymbolicUtils.Code.DestructuredArgs method error in ODEFunction (#1522)
• new ExtraEquationsSystemException in 8.7.0 (#1526)
• structural_simplify does not reduce equations and state variables fully (#1530)

Merged pull requests:

• Allow coefficients to be parameters (#1532) (@YingboMa)

v8.7.0

ModelingToolkit v8.7.0

Diff since v8.6.0

Closed issues:

• parameter tuples having mixed numeric values are converted to the same type (#1475)
• jac and sparse are not implemented for DAEProblem (#1482)
• Solving structurally simplified system fails, but only when jac=true, sparse=true (#1501)

Merged pull requests:

• Better error msg when independent variable detection fails (#1508) (@YingboMa)
• Added functionality for symbolically computing DAE jacobians (#1510) (@Abhishek-1Bhatt)
• remove format character (#1513) (@simeonschaub)
• Update reference tests (#1514) (@ChrisRackauckas)
• Fixed Jacobian for DAEs and added a test for it (#1519) (@Abhishek-1Bhatt)
• Fix invalidate_cache (#1521) (@YingboMa)
• Redo stream connectors (#1525) (@YingboMa)

v8.6.0

ModelingToolkit v8.6.0

Diff since v8.5.5

Closed issues:

• The solution object can't be accessed by symbols (#1497)
• Initial conditions not respected when using generator function (#1505)

v8.5.5

ModelingToolkit v8.5.5

Diff since v8.5.4

Closed issues:

• Julia + VSCode produces import error from ModelingToolkit (#1444)
• overwriting Base function errors with Julia 1.8 (#1468)
• Acausal model with serial resistors fails with UndefVarError - MTK 8.X.X (#1478)

Merged pull requests:

• Patch concrete init (#1490) (@ValentinKaisermayer)
• fixes deprecation from Symbolics (#1491) (@ValentinKaisermayer)
• Update Project.toml (#1492) (@thazhemadam)
• Add missing return (#1498) (@chriselrod)
• More robust observed equations building (#1499) (@YingboMa)
• Add allow_parameter option and make find_eq_solvables less aggressive (#1500) (@YingboMa)

v8.5.4

ModelingToolkit v8.5.4

Diff since v8.5.3

Closed issues:

• DAEProblem fails (#1484)
• Accessing and plotting states (and observables) without namespacing pitfalls (#1488)

Merged pull requests:

• Make observed function building resilient wrt namespacing (#1489) (@YingboMa)

v8.5.3

ModelingToolkit v8.5.3

Diff since v8.5.2

Closed issues:

• dae_index_reduction not working for symbolic arrays (#1240)
• Linear systems of SDEs & Spectral Analysis (#1483)

Merged pull requests:

• Patch process_DEproblem (#1487) (@ValentinKaisermayer)