Avoid for loop?

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..

Answer 1

[madhan ravi]

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 

Answer 2

[Stephen23]

Simpler:

>> hankel(1:6,6:9)
ans =
   1   2   3   4
   2   3   4   5
   3   4   5   6
   4   5   6   7
   5   6   7   8
   6   7   8   9