how to store data in a matrix?

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Lilya
Lilya 2019-7-17
评论： Lilya 2019-7-17
Hi all,
I want to loop over the third dimension of the 3D matrix and calculate the average then sore the resulted data in a new matrix.
For example:
U10_series = [];
for day=1:length(datenum_array); % this time is corresponding to the number of days
filename=strcat('./MERRA2_400.tavg1_2d_ocn_Nx.2019',num2str(datevec_array(day,2),'%02i'),num2str(datevec_array(day,3),'%02i'),'.SUB.nc');
%read U10
U10 = ncread(filename,'U10M');
U10_box = U10(lon_range,lat_range,:);
U10_box_mean = nanmean(U10_box,3);
U10_series = [U10_series,U10_box_mean];
end
where am I mistaken?
The help is much appreciated

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KSSV
KSSV 2019-7-17
U10 = ncread(filename,'U10M');
If your variable U10M is 3D, the above line reads complete data. Your U10 should be 3D. Now you can apply mean on it by specifying the dimension you want.
Also read about ncread, here you can specify the 3D dimension you want to read in a loop. If it is not clear, attach your file for further help.
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KSSV
KSSV 2019-7-17
ncfiles = dir('*.nc') ;
N = length(ncfiles) ;
for i = 1:N
ncfile = ncfiles(i).name ;
lon = ncread(ncfile,'lon') ;
lat = ncread(ncfile,'lat') ;
u = ncread(ncfile,'U10M') ;
v = ncread(ncfile,'V10M') ;
% do what you want
end

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