Many thanks for the explanation about the segments of code I couldn't understand; I'll certainly use those features myself now :)

Apologies for not making my intentions clear in the OP; the original intent was to just 'walk' the stream of data and determine when it 'became somehow stable' and that would define a certain Y-value that I would use later on...

...but if it would make things simpler/'better'(?), let me explain something in a newer posting (see below).