Allocating 500 matrices into one 3D array with a loop
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Hello guys, I have about 500 matrices naming after "yfit" + yr/month/date (such as yfit20000115). I want to save all of them into one 3d array, here is my code:
x = zeros(1455,1464,500);
x(:,:,1) = yfit20000115;
x(:,:,2) = yfit20000131;
x(:,:,3) = yfit20000216;
x(:,:,4) = yfit20000303;
x(:,:,5) = yfit20000319;
x(:,:,6) = yfit20000404;
........................ until x(:,:,500)
Can anybody please tell me how to loop through this? Especially, I do not know how to put the names into the loop. I thought about using EVAL, but eval's instruction on matlab seems very short and simple. Please help, thank you!
4 Kommentare
Stephen23
am 20 Nov. 2017
Bearbeitet: Stephen23
am 20 Nov. 2017
@Zoe: simply load the .mat file into one output variable (which is a structure), then loop over the fields of that structure. See Nicolas Schmit's answer to know how to do this.
Do NOT load 500 individual arrays into your workspace and then try to use eval to access them, unless you want to write slow, buggy, complex, inefficient, hard-to-debug code. Read this to why doing that is a very inefficient way to write code:
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Nicolas Schmit
am 20 Nov. 2017
Use
S = load('your_mat_file');
To load your data into a structure S, Then loop over the fields of S.
fields = fieldnames(S);
x = zeros(1455,1464,500);
for k=1:500
x(:, :, k) = S.(f{k});
end
2 Kommentare
Jan
am 20 Nov. 2017
Or:
S = load('your_mat_file');
fields = fieldnames(S);
[fields, index] = sort(fields);
match = strncmp(fields, 'yfit', 4);
dataCell = struct2cell(S);
x = cat(3, dataCell{index});
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