You could store this in a cell array. See below for a demonstration and some comments on the concept:
num_models = 10;
num_sets = [6 3 7 5 3 2 1 4 6 3]; % each value represents the number of sets for a given model
% create a cell array in which each column is a model and each row is a set
MyData = cell( max(num_sets), num_models);
% populate the cell array with data
for i = 1:num_models
for j = 1:num_sets(i)
% fill with random data
num_rows = randi([1 10]); % pick random number of rows between 1 and 10
num_cols = randi([1 10]); % pick random number of columns between 1 and 10
MyData{i,j} = rand(num_rows,num_cols);
end
end
% have a look at the data
MyData
% have a look at the data of the 2nd set of the third model:
Model_3_Set_2 = MyData{2,3}
