MATLAB: Avoid for loop

forfor loopMATLAB

I want to generate arbitrary matrix of indeces, e.g.:
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7
5 6 7 8
6 7 8 9
One can observe a series in it. I solved the problem as follows:
% --- Inputs
x      = 1:9;
window = 4;
% --- creating the matrix
mm     = length(x);
nb_rws = mm - window + 1;
y      = ones(nb_rws,window);
for i = 1 : nb_rws
    
    y(i,:) = x(i : i + window -1);
    
end
y
Is there a solution to avoid the for loop? Thanks..

Best Answer

y=hankel((1:4),(4:9))'
Gives:
y =
     1     2     3     4
     2     3     4     5
     3     4     5     6
     4     5     6     7
     5     6     7     8
     6     7     8     9
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