MATLAB: How to save inner loop data with outer loop data in one matfile

evalfor looploopMATLABsave

Hello Matlabers!
So basically i have this code
for i=1:5
    
    r=5;
    W = rand(m,r);
    H = rand(r,n);
    
    for rank=2:2:20  % Now for every value of rank I want to compute W0 and H0
      
          W0 = rand(m,rank);
          H0 = rand(rank,n);
    end
    
    % finally in the end I want to save all values. For each iteration of the OUTER loop, 
    % I will have all values of the INNER loop as well.
    
    save( ['DATA/data_',int2str(i),'.mat'],'W','H','W0','H0','-v7.3' )
    
    
end
So i wish to have my matfile contain files like
Data_1
    W,H
    W0_2,W0_4,W0_6,...,W0_20
Data_2
        W,H
    W0_2,W0_4,W0_6,...,W0_20
.
.
Data_5
        W,H
    W0_2,W0_4,W0_6,...,W0_20

Best Answer

Using a structure (or any other array) is better than using dynamically named variables:
m = 2;
n = 3;
r = 5;
V = 2:2:20;
for ii = 1:5
    W = rand(m,r);
    H = rand(r,n);
    S = struct();
    for jj = 1:numel(V)
        S(jj).W0 = rand(m,V(jj));
        S(jj).H0 = rand(V(jj),n);
    end
    F = fullfile('DATA',sprintf('data_%d.mat',ii));
    save(F,'W','H','S','V')
end
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