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### Description
[CombustionMeintjes1990C.zip](https://github.com/OpenModelica/OpenModelica/files/15111087/CombustionMeintjes1990C.zip)
```modelica
model CombustionMeintjes1990C
constant Real…
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See [Sandu (2000) Time stepping methods that favor positivity for atmospheric chemistry modeling](https://www.mtu.edu/cs/research/papers/pdfs/favor-report.pdf). There are four methods
- A: three-stag…
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Alex, first of all my gratitude to you. Your repo is some of the only places on the internet, where I can find some of this SFM stuff coded up from scratch in python.
I am specifically looking at you…
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It's pretty unintuitive IMO that `with_jacobians` defaults to _all the inputs_, but _the first output_. I'm honestly not sure why we did this - maybe because sometimes the second output is `is_valid`…
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AD currently requires that we declare Jacobians for most functions, even though these are never referenced in the output. For example, prelude.ks contains
```
(edef [D to_float] (LM Integer Float)…
dcrc2 updated
3 years ago
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Hi!
Thanks for the contributions!! I am facing a weird sutiation in which I am computing the jacobians of a model w.r.t to the parameters (which are fixed and cannot be tuned) and I want to optimiz…
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It would be useful to use JAX autodiff functionality to verify that the Jacobians specified by the user are correct.
We could also include autodiff directly in the model itself such that one does n…
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Hi!
Nice work with odes! But, of course, i have a question. Is this possible to use sparse jacobians in IDA? And another one: can i use iterative preconditioned solvers with custom preconditioner? …
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in this line:
```
Phi_tr.block(3, 0, 3, 3) = -R_3D.transpose() * skew_x(R_3D.transpose() * (new_p - p_3D));
```
I think `new_p` is equal to `(p_3D + R_3D.transpose()*v*dt)`, then the line come…