v3.18.0

ModelingToolkit v3.18.0

Diff since v3.17.0

Closed issues:

• build_function is allocating for StaticArrays (#559)

Merged pull requests:

• CompatHelper: bump compat for "Latexify" to "0.14" (#561) (@github-actions[bot])
• Add ControlSystem for Nonlinear Optimal Control (#562) (@ChrisRackauckas)
• Direct compilation of C function from CTarget via GCC (#566) (@ChrisRackauckas)
• converting to C tutorial (#567) (@ChrisRackauckas)

v3.17.0

ModelingToolkit v3.17.0

Diff since v3.16.0

Closed issues:

• Simple derivative example fails (#545)
• New release? (#557)

Merged pull requests:

• Fix #545 (#548) (@shashi)
• CompatHelper: bump compat for "DataStructures" to "0.18" (#555) (@github-actions[bot])

v3.16.0

ModelingToolkit v3.16.0

Diff since v3.15.0

Closed issues:

• Add a function to extract all the variables used in an expression (#549)

Merged pull requests:

• Dict-based linearity (#550) (@shashi)

v3.15.0

ModelingToolkit v3.15.0

Diff since v3.14.2

Merged pull requests:

• Add noise scaling option to convert(::SDESystem,rs:ReactionSystem...) docstring (#543) (@TorkelE)
• revert to previous ismassaction version (#544) (@isaacsas)

v3.14.2

ModelingToolkit v3.14.2

Diff since v3.14.1

Merged pull requests:

• [WIP] Causal Input/Output variables, explicit algebraic variables, aliases, and open connections (#400) (@ChrisRackauckas)
• Convert user supplied independent variable to Variable and better err… (#540) (@YingboMa)

v3.14.1

ModelingToolkit v3.14.1

Diff since v3.14.0

Merged pull requests:

• abs for diffusion in CLE (#535) (@isaacsas)
• Remove the error when no differential variables are present (#536) (@YingboMa)

v3.14.0

ModelingToolkit v3.14.0

Diff since v3.13.0

Closed issues:

• Fast symbolic derivatives (#127)
• Doctests fail (#148)
• Change printing of variables (#158)
• Sparse Jacobian calculation currently needs to go through dense (#281)
• Hash of Operations and Equations (#320)
• Proper syntax of ODESystem unclear (#321)
• Compiler Target: Dagger or Neural Schedulers (#366)
• Tutorial ODE Problem does not run (#493)
• component doesn't work? (#500)
• fail to generate jacobian (#503)
• expand_derivatives doesn't expand sum of derivatives (#505)
• Multi-level ODESystem (#514)

Merged pull requests:

• automated linearity checks (#382) (@ChrisRackauckas)
• jacobian performance improvements (#499) (@shashi)
• pervasive use of sparsejacobian (#501) (@ChrisRackauckas)
• avoid promotion of constants to Operation (#506) (@shashi)
• Recurse through subexpressions in expand_derivatives (#507) (@shashi)
• Add fillzeros kwarg to build_function (#508) (@YingboMa)
• fix make_operation when op is a Variable or Expression but all args are Constant (#509) (@shashi)
• implement expand_derivatives for Equation (#510) (@simeonschaub)
• Sparse Hessians (#511) (@shashi)
• various symbolic differentiation optimizations (#512) (@shashi)
• define modelingtoolkitize for SDESystem with conversion tests (#513) (@frankschae)
• update ReactionSystem docs and add reaction dep graphs (#515) (@isaacsas)
• fix automated parallelism with sparsejacobian (#516) (@ChrisRackauckas)
• add option to disable rate law scaling for reactions (#519) (@isaacsas)
• Fix typo + add link to lambdify in docs (#521) (@briochemc)
• Fix LaTeX typo in symbolic_functions.md (#522) (@briochemc)
• Update symbolic_functions.md (#523) (@briochemc)
• Update symbolic_functions.md (#524) (@briochemc)
• Fix hessian_sparsity documentation? (#527) (@ChrisRackauckas)
• add sparsity overloads to AbstractSystems (#528) (@ChrisRackauckas)
• fix fillzeros with parallelism (#529) (@ChrisRackauckas)
• Noise scaling in reaction sys sd es 2 (#530) (@TorkelE)

v3.13.0

ModelingToolkit v3.13.0

Diff since v3.12.2

Merged pull requests:

• speed up iszero (#494) (@shashi)
• force_SA and document new options (#497) (@ChrisRackauckas)
• Fast Jacobian Sparsity (#498) (@shashi)

v3.12.2

ModelingToolkit v3.12.2

Diff since v3.12.1

Closed issues:

• build_function doesn't like array expressions with single scalar variable (#495)

Merged pull requests:

• Speed up JumpSystem generation from ReactionSystems (#444) (@isaacsas)
• safer OOP conversion strategies (#496) (@ChrisRackauckas)

v3.12.1

ModelingToolkit v3.12.1

Diff since v3.12.0

Merged pull requests:

• Jacobians safe for LabelledArrays (#492) (@ChrisRackauckas)