What are your input data? A list of files stored in a folder? (As usual: please explain this instead of letting the readers guess the details.) Then:
List = dir(fullfile('C:\Your\Folder', '*.jpg'));
File = fullfile({List.folder}, {List.Name});
Index = 1:numel(File);
for k = 1:numel(File) / 5
selected = randperm(numel(Index), 5); % Select 5 of the existing images
fprintf('Round %d:\n', k); % Show them (or do whatever you need)
fprintf(' %s\n', File(Index(selected)));
Index(selected) = []; % Remove selected images from the list
end
Another simple approach:
List = dir(fullfile('C:\Your\Folder', '*.jpg'));
File = fullfile({List.folder}, {List.Name});
Index = randperm(numel(File));
Blocks = reshape(Index, 5, []); % Assuming than #files is multiple of 5
% Now the column vector Blocks(:, k) contains the indices of 5 randomly selected images.
for k = 1:size(Blocks, 2)
fprintf(' %d', Blocks(:, k));
fprintf('\n');
end
