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how to make 3d array by stacking 2d arrays from sentinel 5p data?

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SWARNENDU PAL 2021 年 6 月 15 日
コメント済み: the cyclist 2021 年 6 月 15 日
I have 36 different netcdf files for one month. Every file contains an array of 215x3245 size. Now i want to make an 3d array of size 36x215x3245 using those 36 different files. I could not upload the files as those are really big files. I can provide the code for doing this thing :
files = dir('S5P_OFFL_L2__CH4____201901*.*');
for j = 1:36
hello(i,:,:) = ncread(files(i).name,'/PRODUCT/methane_mixing_ratio');
I have the file name type in the first line. Total 36 files are there with this name. Now in every file the variable '/PRODUCT/methane_mixing_ratio' has a size of 215x3245. Now I want to stack all these 36 files using loop. How can I do that? Thank you.


the cyclist
the cyclist 2021 年 6 月 15 日
編集済み: the cyclist 2021 年 6 月 15 日
You are looping over the wrong dimension in your code. You want something like this:
files = dir('S5P_OFFL_L2__CH4____201901*.*');
% Preallocate the large array
hello = zeros(215,3245,36);
% Fill in each "slice" along the 3rd dimension
for j = 1:36
hello(:,:,j) = ncread(files(i).name,'/PRODUCT/methane_mixing_ratio'); % Note that I shifted j to the third position
  4 件のコメント
the cyclist
the cyclist 2021 年 6 月 15 日
Obviously, we cannot know why one of your input files has an extra column. That is something you'll need to figure out.
After you figure that out, it is easy to delete a single column from an array, if that is the solution:
% Define a random input
rng default
A = rand(4,3)
A = 4×3
0.8147 0.6324 0.9575 0.9058 0.0975 0.9649 0.1270 0.2785 0.1576 0.9134 0.5469 0.9706
% Delete the 2nd column:
A(:,2) = []
A = 4×2
0.8147 0.9575 0.9058 0.9649 0.1270 0.1576 0.9134 0.9706


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