Obtain the mean angle (circle mean of a file)

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

Answer 1

[Bruno Luong]

angledata_deg is your angle data in degree

meanangle_deg = rad2deg(atan2(mean(sind(angledata_deg),2),mean(cosd(angledata_deg),2)))

[Ana Soph]

thanks, i am using it, but i am obtain negative values...

i don't know if i am doing correctly

[Bruno Luong]

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)

[Ana Soph]

thank you so much :D

Answer 2

[Jessica Langsdale]

%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.

[Ana Soph]

But i need the circle mean, not the regular mean, because are degree

Answer 3

[KSSV]

num = xlsread(myfile) ;  % better use readtable
iwant = mean(num,2) ; 

[Ana Soph]

But i need the circle mean bc i am working with degrees

[KSSV]

What is circle mean? Your units are in degrees, your mean value will be in degrees.

[Ana Soph]

yes but you need something like that https://en.wikipedia.org/wiki/Mean_of_circular_quantities