# How can i calculate mean wind direction(in degrees) from 1 minute to 10 minutes?

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Ana Soph il 6 Mag 2020
Commentato: Ana Soph il 8 Mag 2020
Hi everybody, i have a problem, i have a 1 min data of the wind direction(in degrees) of 3 months, but i want the average every 10 minutes of this data.
I have the matlab 2015, so .. i can't use circ.mean.
Can you help me with that, please?
Best!!!
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Walter Roberson il 6 Mag 2020
Modificato: Walter Roberson il 6 Mag 2020
What is "circ.mean" ?
What form is the time information in? Or is it safe to assume that the data definitely starts on an even 10 minute boundary and is definitely every 1 minute?
Ana Soph il 6 Mag 2020
1. circ_mean is Mean direction of a sample of circular data (this is what i need)
2. Yes, is safe to assume that the data definitely starts on an even 10 minute boundary and is definitely every 1 minute

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### Risposta accettata

Ana Soph il 7 Mag 2020
The final script is:
ten_minute_avarege = meanangle(reshape(M, 10, []), 'omitnan')
A = ten_minute_avarege';
for i=1:length(A)
if A(i)<0, A(i)=A(i)+360; end
end
A = A(:,1);
A = reshape(A,144,length(A)/144);
xlswrite('datosexcel1.xlsx', A', 'Hoja1', 'A1')
thanks all! :D
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Walter Roberson il 7 Mag 2020
It should work with numeric values, including values that might include nan.
It just is not an intended way of calling meanangle. But it will work because meanangle was sloppy in not checking that the parameters were what the function expected.
Ana Soph il 8 Mag 2020
oh.. ok, i understand

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### Più risposte (1)

Walter Roberson il 6 Mag 2020
If you can be sure that the data starts on a 10-minute boundary and that there is no missing data, then
ten_minute_avarege = mean(reshape(WindData, 10, []), 'omitnan')
If you are sure you have no nan entries, then you can leave out the 'omitnan'
##### 8 CommentiMostra 6 commenti meno recentiNascondi 6 commenti meno recenti
Walter Roberson il 7 Mag 2020
You have to download the code from the File Exchange, and unzip it into its own directory that is not under the MATLAB installation directory. Then use pathtool to add that directory to the path, and save.
Ana Soph il 7 Mag 2020
THANK YOUUUUUU <3

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