Linearly detrended and a 30-day running mean

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

Answer 1

[Steven Lord]

See the detrend and movmean functions.

[Ali Saremi]

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