Avoid using for loops as it results in ram crash and slow down

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Muhannad 2015-12-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/258572-avoid-using-for-loops-as-it-results-in-ram-crash-and-slow-down

评论： Muhannad 2015-12-15

My code is:

      for i = 1:n
          for ii = 1:i-1
              for iii = 1:ii-1
                  for iv = 1:iii-1
                    A = data(l([i ii iii iv 27]), 1:3);
      %             C(i,ii) = norm(A)*norm(inv(A));
      %             C(i,ii,iii) = norm(A)*norm(inv(A));
                    C(i,ii,iii, iv, 1) = cond(A);
  %                   tmp = svd(A, 0); 
%                   C(i,ii,iii,iv) = 0; 
    %               vif{i,ii,iii} = diag(inv(A'*A));
    %               vif1{i,ii,iii} = diag(inv(A*A'));
                end
            end
        end
        i
    end

The loop test for only 4 different wavelengths and here I am fixing the the 5th by using 27 in "A = data(l([i ii iii iv 27]), 1:3)", I am interested in adding the fifth as a loop or maybe 6th as well but the problem my ram is crashing and slow down the code a lot.

Any suggestion on how to solve this problem?

Regards,