MATLAB: Adding columns to matrix using circshift by auto incrementing

circshiftincrementmatrix array

I want to develop a square matrix from a column matrix using circshift. Here is an example code:
z=[0;1;2;3];
x=[z,circshift(z,1),circshift(z,2),circshift(z,3)];
Output: >> x
x =
     0     3     2     1
     1     0     3     2
     2     1     0     3
     3     2     1     0
I have to do similar for the order of 1200 instead of 4 so I want it to be automatic. Can some one please suggest how can I use loop of vector in this case?
Thanks

Best Answer

You coud use a simple loop:
z          = [0;1;2;3];
z_mat      = zeros(length(z));
z_mat(:,1) = z;
for ii = 2:length(z)
    z_mat(:,ii)= circshift(z,ii);
end
Initializing a matrix ( zeros ) is faster than appending vectors to a matrix.
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