MATLAB: Random choice of elements for n times, without choosing the same element more than once

random choise

Hello! I am trying to randomly choose one element from a string for a predifined number of times but I don't know how I can avoid getting the same element more than once.. Beneath is the code I wrote (my question may be more comprehensible through the comment in the code).
%% ************************************ *******************************************
letters = 'ABCD';
ntrials = 3;
nletters = 4;
for i = 2: ntrials
    for j = 1: nletters 
        *% it needs to display a random letter from letters but the same
        % letter must NOT appear more than once in this nested loop.* 
    end
end
% ******************************* end of code ************************************************
output example: BCAD ADCB
Thanks a lot!

Best Answer

Perhaps you mean:
for i = 2: ntrials
  C = letters(randperm(length(letters), nletters))
end
Do you want to store the different outputs?
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