Using the function movmean

Hello, so i have a data set of average wave heights taken every 10 minutes for the last 60 years. I want to use the function 'movmean' to give an 8 week moving average of wave heights. Any idea how I might go about this?

Answer 1

[Image Analyst]

10 minutes for 8 weeks is 8064 elements I believe. So just do

averageWaveHeights = movmean(waveHeights, 8064);

That's pretty obvious, so I'm wondering what the real problem is. Like your elements are actually not every 10 minutes or something. Even if they weren't exactly 10 minute, it wouldn't matter much as long as the total window width covers 8 weeks. Did you try movmean() at all yet? What was the problem you had with it?

[Chris Turnes]

If you do have irregularly spaced data, and still want an 8 week moving average, you can specify this with the 'SamplePoints' Name-Value pair starting in R2017a. That would be something like:

averageWaveHeights = movmean(waveHeights, days(8*7), 'SamplePoints', timeStamps);

[nlm]

How to calculate a 10 day average when the timeseries has duplicate dates. I do not want to average the dupliate dates priorly. I want to include them in the 10 day average. When I use movmean, I get this error, any suggestions ?

Error using builtin
'SamplePoints' value contains duplicates.

Error in datetime/movmean (line 105)
    y = builtin('_movmeandt', args{:});

[Image Analyst]

Use unique() to remove duplicates. Start a new question and attach your data if you still have problems.