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

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Ana Soph 2020-5-6

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评论： Ana Soph 2020-5-8

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?

Thank you in advance

Best!!!

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Walter Roberson 2020-5-6

编辑：Walter Roberson 2020-5-6

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 2020-5-6

hi, thanks for answering, about your questions...

circ_mean is Mean direction of a sample of circular data (this is what i need)
Yes, is safe to assume that the data definitely starts on an even 10 minute boundary and is definitely every 1 minute

i am waiting your answer, thanks (:

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Ana Soph 2020-5-7

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https://ww2.mathworks.cn/matlabcentral/answers/523312-how-can-i-calculate-mean-wind-direction-in-degrees-from-1-minute-to-10-minutes#answer_430838

在 MATLAB Online 中打开

The final script is:

M = xlsread('Dic2019','Dic2019mat')
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 2020-5-7

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 2020-5-8

oh.. ok, i understand

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Walter Roberson 2020-5-6

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在 MATLAB Online 中打开

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'

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 2020-5-7