How to generate non repeat integer?

Dear experts,

I have randomly generated values 1,2,3 to allocate 15 elements into three groups, I then want to generate random ranking in each group, i.e. generate three groups of consecutive numbers, and then randonly assign them to each group member. I was wondering what code can help me achieve this?

Many thanks!

Answer 1

[chicken vector]

% Input data:
numberOfElements = 15;
numberOfGroups = 3;

% Pre-process:
elementsPerGroup = numberOfElements / numberOfGroups;
ranking = zeros(numberOfGroups, elementsPerGroup);

% Loop over groups:
for group = 1 : numberOfGroups
    
    % Randomise ranking:
    ranking(group,:) = randperm(elementsPerGroup);
end

You can use structures to have clear outputs:

% Input data:
numberOfElements = 15;
numberOfGroups = 3;

% Pre-process:
elementsPerGroup = numberOfElements / numberOfGroups;
ranking = struct;

% Loop over groups:
for group = 1 : numberOfGroups
    
    % Randomise ranking:
    ranking.(['group' num2str(group)]) = randperm(elementsPerGroup);
end

[Rouyu Chen]

Thank you so much!