How to create a sqaure matrix from a one dimensional vector

Hi all,

I want to create a n*n matric from a 1*n matrix such that all possible every column is the shifted version of the previous one. For example, 1 2 3 4 then matrix should look like

1 2 3 4 
2 3 4 1
3 4 1 2
4 1 2 3

Thanks

Answer 1

[Sean de Wolski]

x = 1:4;
gallery('circul',x) %gallery strikes again!

More

fliplr(gallery('circul',fliplr(x)))

since you want it shifted to the left.

[Wayne King]

Nice Sean, I didn't think of that!

Answer 2

[Wayne King]

One way:

x = [1 2 3 4];
x = x(:);
x = repmat(x,1,4);
for nn = 2:4
    x(:,nn) = circshift(x(:,nn),nn-1);
end