Implementing a Lowpass Filter?

[LeeElectricPlant]

Hello PlotJuggler Community,

In reviewing PlotJuggler tutorial videos, I saw one in which there was a "1st_order_lowpass" filter listed in the Saved Functions tab of the Create a Custom Timeseries window.

It's 8 seconds into this video:
https://vimeo.com/311245098

Is there any way to get access to the Lua code needed to implement that filter and/or other lowpass filters that may exist?

I'm trying to implement a filter to get rid of the 60 Hz noise (from electrical power outlets) in my signal. I do not have experience with Lua, and to the extent I have looked into learning it, I haven't found any way to do it.

Thank you for this wonderful tool!