How to only retain a fixed number of sublists that contain specific values.

retain_fixed_number_sublists.m

% How to only retain a fixed number of sublists that contain specific values.

% Sublists to analyze:
ids = {{0, 0}, {1, 0}, {0, 1, 2}, {0, 2}, {1, 2}, {0, 2}, {1, 1}};

counts = [0, 0, 0];
for i=1:length(ids),
    id = cell2mat(ids{i});

    % Retain `id` only if it contains at least one
    % value not having a count > 3:
    retain = 0;
    for j=id,
        if counts(j+1) < 3,
            retain = 1;
            break;
        end
    end
    if retain,
        fprintf(['id:     [', repmat(' %d ', 1, length(id)), ']\n'], id);
        fprintf(['counts: [', repmat(' %d ', 1, length(counts)), ']\n'], counts);
        fprintf('---\n');

        % If j is represented in entry `id`,
        % increase the count of retained entries
        % that contain j:
        for j=[0,1,2],
            if ismember(j, id),
                counts(j+1) = counts(j+1) + 1;
            end
        end
    end
end