Linearly detrended and a 30-day running mean

Question

Ali Saremi 2021-5-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/821895-linearly-detrended-and-a-30-day-running-mean

编辑： Ali Saremi 2021-5-17

采纳的回答： Steven Lord

Observations.xlsx

Dear Sir/Madam,

I hope you are well.

I have a dataset consisiting of water level observations.

The dataset needs to be linearly detrended first. Afterwards, the seasonal and interannual variability components need to be drived by applying a 30-day running mean to the detrended time series.

I was wondering if anyone could help me with this. Thank you and I look forward to hearing from you.

Kind regards,

Ali

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Answer 1

Steven Lord 2021-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/821895-linearly-detrended-and-a-30-day-running-mean#answer_692490

See the detrend and movmean functions.

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Ali Saremi 2021-5-17

编辑：Ali Saremi 2021-5-17

Hi Steven,

Thank for your reply. I did import my data into MATLAB and I was able to detrend the data column and plot it. but when I wanted to display a fit on the figure (linear) through Tools/linear, the option was off becasue of using datetime (i think) in the plot, so I had to plot the detrend values solely to fit a linear line in the detrended plot. I was wondering if you could help me with that. In my plot i want the date and detrend values while i could be able to display fits on figure.

Thank you and I look forward to hearing from you.

Kind regards,

Ali

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