sharpen news

Author: hexaeder

NEWS.md

@@ -4,7 +4,8 @@
 
 - **ModelingToolkit v11 compatibility** ([#344](https://github.com/JuliaDynamics/NetworkDynamics.jl/pull/344)):
   - Raises compat from `ModelingToolkit` v10 to v11. MTK v11 split into `ModelingToolkitBase` (MIT-licensed) and `ModelingToolkit` (AGPL-licensed); NetworkDynamics.jl now only requires the MIT-licensed `ModelingToolkitBase` as a direct dependency, dropping the AGPL dependency.
-  - A custom structural simplification pipeline is added as the new default (`mtkcompile=false`). With `mtkcompile=true`, MTK's own `mtkcompile` is called: full structural simplification when `ModelingToolkit` is loaded, or the stub from `ModelingToolkitBase` (no structural simplification) when it is not.
+  - A custom structural-simplification pipeline replaces MTK's `mtkcompile` as the new default (`mtkcompile=false`). It performs alias/linear-state elimination, breaks algebraic and nonlinear loops, and handles simple DAE index reduction. Set the global default via `NetworkDynamics.set_mtkcompile!`; use `mtkcompile=:compare` to run both backends and print a comparison for debugging. With `mtkcompile=true`, MTK's own `mtkcompile` is called: full structural simplification when `ModelingToolkit` is loaded, or the stub from `ModelingToolkitBase` (no structural simplification) when it is not.
+  - MTK models now warn when they contain discrete variables (unsupported).
   - New extension dependencies: `Moshi`, `Hungarian`.
   - **Dependency version bumps**: `SymbolicUtils` ≥ 4, `Symbolics` ≥ 7.
   - `implicit_output` macro updated to use `Symbolics.@register_symbolic` instead of `ModelingToolkit.@register_symbolic`.
@@ -14,8 +15,9 @@
   - `find_fixpoint(nw, x0::NWState, p::NWParameter)` is deprecated; use `find_fixpoint(nw, x0::NWState)`.
   - The default initial state for fixpoint search now applies guesses and formulas automatically (`guess=true, apply_formulas=true`).
 - **`NWState` constructor** gains `guess`, `apply_formulas`, and `verbose` keyword arguments. With `default=true` (the default), values are filled in order: defaults/inits → `InitFormula`s → guesses (if `guess=true`) → `GuessFormula`s. `apply_formulas=true` by default; `guess=false` by default.
+- `initialize_component` / `initialize_componentwise` gain a `warn` keyword (default `true`) to silence initialization warnings.
 - `doctor` check: added smoketest for the observable function (`obsf`) of each component.
-- `SciMLBase@3` and `OrdinaryDfifEq@7` compat. Most notably, upstream `DiffEq` changed its default `initializealg` to *check* rather than *reinit* inconsistent initial conditions. To preserve the previous behavior, the `ODEProblem(nw::Network, ...)` constructor now defaults to `initializealg=BrownFullBasicInit()` (deliberately differing from the OrdinaryDiffEq default). Pass `initializealg=...` to the constructor to override. Also, the interface of the `VectorContinuousComponentCallback` changed to fit that of `VectorContinuousCallback`: the affect now receives a buffer with per-element up or down crossing information rather than a single event idx.
+- `SciMLBase@3` and `OrdinaryDiffEq@7` compat. Most notably, upstream `DiffEq` changed its default `initializealg` to *check* rather than *reinit* inconsistent initial conditions. To preserve the previous behavior, the `ODEProblem(nw::Network, ...)` constructor now defaults to `initializealg=BrownFullBasicInit()` (deliberately differing from the OrdinaryDiffEq default). Pass `initializealg=...` to the constructor to override. Also, the interface of the `VectorContinuousComponentCallback` changed to fit that of `VectorContinuousCallback`: the affect now receives a buffer with per-element up or down crossing information rather than a single event idx.
 - new `copy(::Network)` method (dealiases all components and buffers)
 
 ## v0.10.17 Changelog