so you can use randi(12,30,30) to generate a 30x30 matrix of values 1 to 12 to select which of the 12 columns to place in the row/column location. then use for loops to go through each index and specify the column.
example:
x = rand(361,12);
randcolumn = randi(12,30,30);
A = zeros(30,30,361);
for ind = 1:30
for jnd = 1:30
A(ind,jnd,:) = x(randcolumn(ind,jnd));
end
end
