Does anyone know how you would implement a Epanechnikov (parabolic) decay to a field in QGIS field calculator. I am trying to apply varying distance decay functions in order to assess the best suitability.

I have run a Gaussian decay using but I am struggling to find any sources on how you would apply a parabolic decay ("Distance" is the field I am running this on):

```
exp(-("Distance" * "Distance")/(2 * (10000 * 10000 )))
```

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