how to add a filter for Linear Trend Removal?

[jim-dp]

Hello,

I am using PlotJuggler for plotting and filtering creating graphs from sensor data timeseries in csv files. It's very easy to use and has exactly the filters I want: integral, derivative, moving average.

The only problem I have so far is that there is no linear trend removal, which is crucial when using the integral function. Unfortunately, I cannot add a Lua-based filter with trend removal because the filter needs to know the total number of the elements of the timeseries. I simply do not know and cannot find how to access this information*. It seems that the Lua extension of PlotJuggler only supports operations on one value at a time and it does not provide an object (or array) for accessing the whole timeseries. Could you please help?

*Edit for clarification: It is easy to calculate the number of the elements of the timeseries once (PlotJuggler already has a filter for that) but I cannot use this number as a global variable in a new function on the same timeseries.

Best regards