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Currently it returns:
```
In [1]: abs(x).diff(x)
Out[1]:
d d
re(x)⋅──(re(x)) + im(x)⋅──(im(x))
dx dx
─────────────────────────────────
…
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I came across a weird observation with MTK -- a bug? related to `observed` values that are not computed.
A birds eye view of what happened is the following...
* I have an index 1 DAE consisting …
B-LIE updated
9 months ago
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It's really cool that MTK can recover the value of 'observed' variables that have been eliminated from a system by structural simplification. I'm wondering if there's a way to extend this to get the …
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A comment in Gitter ([November 30, 2019 10:35 AM](https://gitter.im/ghdl1/Lobby?at=5de237c5c3d6795b9ff8c77f)) lead to an interesting chat about Digital/Analog simulation with GHDL. There are two relat…
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Consider the RC circuit model in https://github.com/SciML/ModelingToolkit.jl/blob/805811b9ef2da00c3fa5f7460ebf61ecfc1bd9cb/docs/src/tutorials/acausal_components.md#copy-paste-example
We have
```ju…
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I've been looking into the index 3 pendulum model, and just discovered that there is an example of this system in the documentation under **ModelingTookitize Tutorials**, section on **Automated Index …
B-LIE updated
9 months ago
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If `u0` is known to be a parametric function, changing the parameters will affect the initial values (e.g., for ODEs) and/or the initial guess for algebraic equations (e.g., DAEs). This problem can be…
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Our most common input formats, .sdf and .urdf use the terms "link" and "joint" to describe the topology of a multibody system. That can include topological loops, rigid groupings of welded-together li…
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I'm gradually learning to use MTK by converting some examples I have from Modelica to MTK. It is great fun (:grinning:). As part of this, I'd like to *understand* what I'm doing (:open_mouth:); I'm no…
B-LIE updated
9 months ago