Thanks for the workflow!
It does indeed do the job that I needed.
However, the recursive loop makes it quite slow. In my real application I have >500,000 rows in the initial dataset. So looping (in KNIME) is not really feasible.
I was hoping that someone might come up with an idea like “oh, this is a standard problem in signal processing (and there is a node which does exactly what you need)” … 
Any other ideas?
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