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Obtain the mean angle (circle mean of a file)

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Ana Soph
Ana Soph on 5 Aug 2020
Edited: Bruno Luong on 5 Aug 2020
Hi, first of all, thank you for reading me, i need something very simple but i can't find a good program to do this...
The average of wind direction data.
i am using matlab 2019a, and have all this data (for a year) and i need the average of this data (attach photo) for every row (this data are in degree, so this not regular mean is circle mean that i need) , so every 10 minutes, so in the end i want to have only one column, i am using meanangle, but i don't obtain good results. don't obtain good results.
if you can help me I would appreciate it too much

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Accepted Answer

Bruno Luong
Bruno Luong on 5 Aug 2020
Edited: Bruno Luong on 5 Aug 2020
angledata_deg is your angle data in degree
meanangle_deg = rad2deg(atan2(mean(sind(angledata_deg),2),mean(cosd(angledata_deg),2)))

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Ana Soph
Ana Soph on 5 Aug 2020
thanks, i am using it, but i am obtain negative values...
i don't know if i am doing correctly
Bruno Luong
Bruno Luong on 5 Aug 2020
Normal, since atan2 returns angle in [-pi,pi] so it can be negative, if you prefer angle in [0,2*pi]
do this after the first command.
meanangle_deg = mod(meanangle_deg ,360)

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More Answers (2)

Jessica Langsdale
Jessica Langsdale on 5 Aug 2020
%enter the number of rows here
arraySize=5;
meanData=zeros(arraySize,1)
for i=1:5
meanData(i)=mean(originalData(i,:))
end
Replace all the variables with your stuff. I think this is what you need? I'm not quite sure what you mean by 'circle mean' but this fits the description of the second half of your question.

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Ana Soph
Ana Soph on 5 Aug 2020
But i need the circle mean, not the regular mean, because are degree

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KSSV
KSSV on 5 Aug 2020
num = xlsread(myfile) ; % better use readtable
iwant = mean(num,2) ;

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Ana Soph
Ana Soph on 5 Aug 2020
But i need the circle mean bc i am working with degrees
KSSV
KSSV on 5 Aug 2020
What is circle mean? Your units are in degrees, your mean value will be in degrees.

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