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Hi! How can I calculate the average for a 160x140x1x12 which are lat,lon,year and month. I want to calculate the average of month for one year.

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Ameer Hamza
Ameer Hamza 2020-11-6

1 个投票

You can specify the dimension to the mean() function
M = rand(160,140,1,12);
M_new = mean(M, 4)

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hi, can i ask. why when i plot a year, for 12 months, the output for y axis is 0-7 and x-axis is 20-105 but if i calculate the average and then i plot, both x and y axis is 20-140 and 20-160. But, y-axis should be 0-7 because of my latitude.
Ameer Hamza
Ameer Hamza 2020-11-8
编辑：Ameer Hamza 2020-11-8
How are you plotting the two figures? What is the command? Most probably, you are not passing the X and Y matrix in the second case.
The first one i use:
[m,n,p,o]=size(E);
>> for i=1:o
pcolor(lon,lat,E(:,:,:,i));
shading interp
colorbar
drawnow
end
and the size of E is 160 140 1 12. the outcome is like the first figure
but when i average/mean for the months(12);
size of new E is 160 and 140.
so i just pcolor(newfile), and the outcome is like the second figure above.
Ameer Hamza
Ameer Hamza 2020-11-8
编辑：Ameer Hamza 2020-11-8
You also need to pass lon, lat in the 2nd call to pcolor too
pcolor(lon,lat,newfile)
sir, thank you very much. excuse me for my slow brain.
Ameer Hamza
Ameer Hamza 2020-11-8
I am glad to be of help! :)

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