v8.27.0

ModelingToolkit v8.27.0

Diff since v8.26.1

Closed issues:

• Only force unbound causal inputs to be states (#1577)
• Custom rrule not working (#1837)

Merged pull requests:

• Show selected states in MatchedSystemStructure (#1841) (@Keno)
• Update latex ref tests (#1862) (@YingboMa)
• Define complete for hierarchical systems (#1863) (@YingboMa)
• Don't select states that were ag-eliminated (#1864) (@Keno)
• Repeated components optimization and make @named more intuitive (#1866) (@YingboMa)
• Allow find_eq_solvables! to take extra unsed keyword arguments (#1868) (@bowenszhu)
• Only force unbound causal inputs to be states (#1869) (@YingboMa)

v8.26.1

ModelingToolkit v8.26.1

Diff since v8.26.0

Closed issues:

• Linearization of fully connected models (#1792)
• structural_simplify breaks ODESystem (#1854)
• Incorrect handling of inputs that are created as array variable (#1858)
• structural_simplify adds outputs for dummy derivatives (#1859)

Merged pull requests:

• add disturbance models (#1853) (@baggepinnen)
• Handle differentiation chains that are only partly dummy derivatives (#1855) (@YingboMa)
• add name to disturbance model (#1856) (@baggepinnen)
• return IO-processed system from generate_control_function (#1857) (@baggepinnen)
• Fix kind check for array variables (#1860) (@YingboMa)
• Mark explicit io when introducing a new variable (#1861) (@YingboMa)

v8.26.0

ModelingToolkit v8.26.0

Diff since v8.25.0

Closed issues:

• Observed Function bug (#1823)
• varmap_to_vars default promotes to Float64 (#1847)

Merged pull requests:

• Adds binary and integer options to variable metadata (#1798) (@ValentinKaisermayer)
• Fix observed function generation (#1832) (@YingboMa)
• Add debug_system that gives a more helpful error message (#1852) (@YingboMa)

v8.25.0

ModelingToolkit v8.25.0

Diff since v8.24.0

Closed issues:

• ERROR: Differential(t)(Differential(t)(x)) is not a valid LHS (#1846)

Merged pull requests:

• Compute complete_ag that contains irreducible alias information (#1843) (@YingboMa)
• Add state_priority to prefer some states in dummy derivative (#1844) (@YingboMa)
• add docs for linearization (#1849) (@baggepinnen)
• fix docstring for build control function (#1850) (@baggepinnen)
• Don't allow symbolic coefficients in in solvable graph (#1851) (@YingboMa)

v8.24.0

ModelingToolkit v8.24.0

Diff since v8.23.0

Closed issues:

• flatten(sys) and namespace_equations do not handle connect correctly (#1826)
• Confusing typo in error message (#1831)
• Get observed variable from solution error (#1838)

Merged pull requests:

• Strong alias elimination (#1771) (@YingboMa)
• Make pantelides robust against unused derivative vars (#1804) (@Keno)
• fix matrix sizes and input order in linearize (#1816) (@baggepinnen)
• fix getvar access of state (#1824) (@baggepinnen)
• Add verbose REPL printing for SystemStructure (#1829) (@Keno)
• Fix error message (#1833) (@YingboMa)
• Add find and replace in expand_connections (#1839) (@YingboMa)
• pss: Handle the case where variables don't appear in graph (#1842) (@Keno)
• Make the find/replace work for all use cases with AnalysisPoint (#1845) (@baggepinnen)

v8.23.0

ModelingToolkit v8.23.0

Diff since v8.22.1

Closed issues:

• support symbolic indexing integrators with parameters (#1777)

Merged pull requests:

• Use paramsyms from new DiffEqFunctions (#1784) (@AayushSabharwal)

v8.22.1

ModelingToolkit v8.22.1

Diff since v8.22.0

Merged pull requests:

• Reorder metadata and pass kwarg (#1819) (@YingboMa)

v8.22.0

ModelingToolkit v8.22.0

Diff since v8.21.0

Closed issues:

• Automatically shuffle derivative terms to the left hand side of an ODESystem? (#860)
• MethodError: no method matching controls(::ODESystem, ::Vector{Any}) (#1302)
• Fix hasbounds (#1779)
• Handle delays in ODESystem (#1800)
• input output handling does not work on array variables (#1807)
• no method matching nameof(::Term{...}) (#1811)

Merged pull requests:

• Expose specialization options for ODE{Function, Problem} (#1770) (@YingboMa)
• fixes input output handling for array variables (#1808) (@ValentinKaisermayer)
• nameof -> Symbol (#1812) (@baggepinnen)
• Document io argument to structural_simplify (#1815) (@baggepinnen)
• Fixes hasbounds (#1818) (@ValentinKaisermayer)

v8.21.0

ModelingToolkit v8.21.0

Diff since v8.20.0

Closed issues:

• OptimizationSystem ignores constraint (#1134)
• Equality and inequality constraints are silently ignored (#1579)
• ODESystem Metadata (#1744)
• selectively disabling unit validation on specific equations is awkward (#1763)
• Automated sparse Jacobian webpage = hard to navigate (#1772)
• don't override Symbolics.jl sharding heuristics (#1782)
• Constraints in nested systems are ignored (#1785)

Merged pull requests:

• Refactor to pull graph manipulation out of pantelides (#1766) (@Keno)
• [Awaiting Review] Add metadata field to systems (#1768) (@xtalax)
• Fix accidental aliasing between mm and structure.graph (#1769) (@Keno)
• Enable MathJax to fix the Latex prints (#1774) (@ChrisRackauckas)
• Don't show the monster sparse jacobian (#1775) (@ChrisRackauckas)
• Minor refactor: Be consistent about alias_eliminate_graph! return type (#1776) (@Keno)
• Update Validation.md (#1778) (@lamorton)
• set default parallel kwarg to nothing instead of SerialForm (#1783) (@wsphillips)
• Improves OptimizationSystem (#1787) (@ValentinKaisermayer)
• allow bit flagging for system checks (#1789) (@wsphillips)
• doc cov (#1790) (@ArnoStrouwen)
• [skip ci] badges (#1791) (@ArnoStrouwen)
• More robust README example (#1793) (@ChrisRackauckas)
• Update plot and format README (#1795) (@YingboMa)
• MassInstallAction: Install the Invalidations workflow on this repository (#1796) (@devmotion)

v8.20.0

ModelingToolkit v8.20.0

Diff since v8.19.0

Closed issues:

• Possible inconcistency in handling DAE equation order (#1195)
• Unsafe to call constructor to create new systems in system transformation methods (#1752)
• What's the use of field substitutions in ODESystem and how to handle it in system transformation methods? (#1754)
• Get all states (#1757)
• How to avoid duplicate arithmetic computation in modelingtoolkitize and also general MTK systems? (#1760)

Merged pull requests:

• Removed the definition of the unused variable RHS(t) from the copy-pastable example in the docs. (#1762) (@hurak)
• Support FunctionWrappersWrappers in modelingtoolkitize (#1767) (@ChrisRackauckas)