Hello,

I want to implement a wind turbine model using ModelingToolkit.

The core model consists of only three differential equations,

but it includes a lookup-table for the power coefficient.

What is the best way to include a lookup table in ModelingToolkit?

I currently use the following function:

```
using Dierckx, Plots
Cp=[0.024384377390186646,0.03811829845979822,0.05731175742000688,0.0803120051369546,0.10526323380995135,0.1312349486430945,
0.1588590278697544,0.1882995422205645,0.21937359147848456,0.25269290703920616,0.2882162631147021,0.3240355349501659,
0.3607290350346774,0.39295261085207084,0.4141821251393675,0.4274331262027119,0.43636422894857274,0.4414767530303278,
0.443412806515125,0.44365385445693295,0.44317448744425714,0.44218641629727234,0.4407405317795181,0.43888039054963845,
0.4362875461540461,0.4325702155989231,0.4278606704093836,0.4224263790651815,0.4164272616252002,0.40987027258773945,
0.4027832291503407,0.39518785578723936,0.38719847687832065]
TSR = 2.0:0.25:10.0
const cp = Spline1D(TSR, Cp)
plot(TSR, cp(TSR), label="Cp", xlabel="TSR")
```

Can I use this in ModellingToolkit, or do I need a version of the function

that works with dual numbers?

This spline interpolation works only with Float64 numbers.