How to save output of double loop?

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 ?

Answer 1

[Mohammad Sami]

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

[Ammy]

Thank you very much.

Answer 2

[KSSV]

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'));