Saving multiple variables in a mat file from loop

I am trying to save multiple variables in a mat file from a loop. My loops has 10 iterations and every time I calculate 4 different variables. In every step all variables has the same size, ex. SE = [1,100], DE = [1,100], KE = [1,100] and CE = [1,100]. How can I save them all in every iteration?

[Stephen23]

"How can I save them all in every iteration?"

Do you have a good reason for wanting to do that? It would be much more efficient to put all of those values into arrays, and then save the arrays after the loop. Simply use indexing to put the values into some preallocated arrays (indexing is very efficient) and then after the loop save the arrays using one save call (faster and more efficient than multiple calls).

Also read this:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 1

[KSSV]

n = 10 ; % loop count 

filename='test.mat';
File = matfile(filename, 'Writable', true); 

for i = 1:n
  SE = rand(1,2) ;
  DE = rand(1,3) ;
  % save variables to file 
  File.SE(i,1:2) = SE ;
  File.DE(i,1:3) = DE ;
end
clear File;

[Mario Santana]

Good example, but what about SE = rand(2,2)?, I mean for matrix 2 dimensions plus loop dimension. Thanks.

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Ok solved, using cells you can fit it into the requirements of matfiles.