How to move a signal to be on the x-axis

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Salem
Salem 2021-9-23
回答： Chunru 2021-9-23
I receive sets of data (x,y); they form signal waves but some of signals are waving away from the x-axis. So Im wondering what is the way to move the signal (whether its above or below the x-axis) to be centered on the x-axis? note. the signal waves are in a horizontal trend

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Chunru
Chunru 2021-9-23
try "detrend".

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