Do not program that way in MATLAB!
You want this:
x = [1 2 3;4 5 6;7 8 9];
for ii = 1:3
y{ii} = ii*x; % Notice {} and not ()
end
Now you have a cell array that has as each element a matrix:
y{1}
y{2}
y{3}
If you want to make ii go much further than 3, you should pre-allocate the memory for y first...
