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How to save output of double loop?

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Noor Bano
Noor Bano on 17 Sep 2021
Commented: Noor Bano on 17 Sep 2021
If I have
for i=1:n
....
for j=1:m
A=myfunction(...);
end
end
The resultant A's are images, I want to save all A.s in the folder
I have tried the following but it only store A only for j
for i=1:n
....
for j=1:m
A=myfunction(...);
end
imwrite(A,strcat('The folder where I want to store ',num2str{j},'.png'));
end
How to store the output A of double loop ?

Accepted Answer

Mohammad Sami
Mohammad Sami on 17 Sep 2021
Edited: Mohammad Sami on 17 Sep 2021
You should use the fullfile function to create the filepath. Your call to imwrite function is in the outer for loop, hence it will only save once per outer loop. You should call it in the inner loop to save all. Also to avoid overwriting the files, you need both i and j values in the filename.
dirtosave = 'C:\mydir\';
for i=1:n
....
for j=1:m
A=myfunction(...);
fname = sprintf('A_i_%i_j_%i.png',i,j);
imwrite(A,fullfile(dirtosave,fname));
end
end

More Answers (1)

KSSV
KSSV on 17 Sep 2021
A = zeros(n,m) ;
for i=1:n
for j=1:m
A=myfunction(...); % assuming output of the function is 1x1
end
end
imwrite(A,strcat('The folder where I want to store ',num2str{j},'.png'));

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