Is there a function that populates a matrix whose minor diagonal are all the same?

Is there a function that populates a matrix whose minor diagonal are all the same, according to the given (odd-numbered) vector? For example, for

[1, 7.9, 100, 18.2, -3.4]

, we can get a 3x3 matrix:

1    7.9  100
7.9  100  18.2
100  18.2 -3.4

I can of course populate this matrix myself. I am just wondering if there is a single function provided by Matlab that can do it. Thanks.

Answer 1

[Stephen23]

Use hankel:

>> V = [1,7.9,100,18.2,-3.4];
>> hankel(V(1:3),V(3:end))
ans =
         1         7.9         100
       7.9         100        18.2
       100        18.2        -3.4

You can easily calculate the midpoint index:

N = (1+numel(V))/2;
hankel(V(1:N),V(N:end))

[zzzhhh]

Wow!