How do I remove a known trendline from data?

Gail Distefano

2022 8 26

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Hi,

I have determined that the data I have captured has a systematic linear trend with gradient 0.003. Is there a straightforward way to detrend my data from this known trend. I don't want to use the function detrend because it might remove a trend specific to that acquisition in addition to the known systematic trend.

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KSSV 2022-8-26

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Use polyfit, fit a striaght line and subtract this from the data.

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Gail Distefano 2022-8-26

Many thanks for your answer. I'm afraid I don't understand what you mean.I don't want to fit a straight line to my data. I want to remove a slope of 0.003 from the signal in the attached figure.