v8.19.0

ModelingToolkit v8.19.0

Diff since v8.18.9

Closed issues:

• Collecting symbolic array breaks usage of all on symbolic arrays (#1742)
• Observed equation instead of var returned with getvar (#1743)
• alias_elimination StackOverflowError (#1751)

Merged pull requests:

• return the lhs instead of observable equation from getvar (#1745) (@wsphillips)
• Update authors (#1750) (@YingboMa)
• doc: edits to Events (#1753) (@visr)
• fix a typo in unit check error handling (#1756) (@wsphillips)
• Forward sys to SciMLFunctions (#1758) (@YingboMa)
• Remember to mark the predecessors as processed as well to avoid cycles in alias elimination (#1759) (@YingboMa)

v8.18.9

ModelingToolkit v8.18.9

Diff since v8.18.8

Closed issues:

• ODESystem doesn't check parameters and variables are disjoint (#1735)

Merged pull requests:

• Check states and parameters are actually states and parameters (#1739) (@YingboMa)

v8.18.8

ModelingToolkit v8.18.8

Diff since v8.18.7

Closed issues:

• variable substitution and solved states not applied to symbolic callback expressions (#1721)
• Observed variables depends on differentiated variable but it's not explicit solved. (#1722)
• Improve callback interface for MTK (#1734)
• Broadcasting operation between symbolic array and symbolic variable errors out (#1736)

Merged pull requests:

• Make sure that irreducible variables don't get eliminated by accident (#1738) (@YingboMa)

v8.18.7

ModelingToolkit v8.18.7

Diff since v8.18.6

Closed issues:

• ODAEProblem messes with prob.f.syms (#1732)

Merged pull requests:

• Fix syms in ODAEProblem (#1733) (@YingboMa)

v8.18.6

ModelingToolkit v8.18.6

Diff since v8.18.5

Merged pull requests:

• register -> register_symbolic (#1731) (@ChrisRackauckas)

v8.18.5

ModelingToolkit v8.18.5

Diff since v8.18.4

Closed issues:

• ERROR: tearing failled because the system is singular. (#1716)
• ERROR: ArgumentError: u2, 1 is either an observed nor a state variable. (#1720)
• ODAEProblem for the time equation (#1725)

Merged pull requests:

• Use efficient partial Jacobian evaluation in linearization_function (#1724) (@YingboMa)
• added test for symbolic continuous_events (#1728) (@hstrey)
• Event basics (#1729) (@isaacsas)
• Better error msg and set the size of the sparsity matrix (#1730) (@YingboMa)

v8.18.4

ModelingToolkit v8.18.4

Diff since v8.18.3

Closed issues:

• Bug in structural_simplify: equations unbalanced with negative RHS term (#1713)
• SymbolicDiscreteCallback fails for non-timebased events (#1717)

Merged pull requests:

• Add events to SDESystems and JumpSystems (#1714) (@isaacsas)
• Make sure D(-D(x)) gets expanded in alias elimination (#1718) (@YingboMa)
• hashing for discrete cb conditions (#1719) (@wsphillips)

v8.18.3

ModelingToolkit v8.18.3

Diff since v8.18.2

Merged pull requests:

• system-specific dispatches for the docs (#1709) (@ChrisRackauckas)
• Fix docstrings and docs (#1711) (@ChrisRackauckas)
• fix some more docstrings (#1712) (@ChrisRackauckas)

v8.18.2

ModelingToolkit v8.18.2

Diff since v8.18.1

Closed issues:

• Error when running tutorial, register_symbolic not defined (#1703)
• Does structural_simplify work well for DAE problems? And a problem about #1575 (#1704)
• Minus sign appears after structural_simplify when composing (#1705)

Merged pull requests:

• Fix alias elimination update (#1707) (@YingboMa)

v8.18.1

ModelingToolkit v8.18.1

Diff since v8.18.0

Merged pull requests:

• Typo (#1702) (@ChrisRackauckas)