Well I forgot the details, but as far as I know a Low pass filter is a
frequency domain filter. My input signal frequency is fixed though (with
minor deviations + some DC offset), yet it is important that there is no
drop to zero, nor that it restarts at local max values only.
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Sent from: https://octave.1599824.n4.nabble.com/Octave-General-f1599825.html
Unless you can explain it better as to what you want, I still think a low pass filter is what you want.
A low pass filter is like doing a running average. You can do a short running average , or any length of running average.
But if you don't want a running average, then explain what you do want. :-)
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DAS