MATLAB: Creating Diagonal Matrix from a Vector

Question

I have a vector g = [g0 g1 g2 g3 … gx]

I want to create a matrix of the form:

Here x = (m-n)

Any thoughts on how I can do this?

Answer 1

The efficient MATLAB approach:

g = [1,2,3,4,5];
z = zeros(1,numel(g)-1);
m = toeplitz([g(1),z],[g,z])
m = 5×9
     1     2     3     4     5     0     0     0     0
     0     1     2     3     4     5     0     0     0
     0     0     1     2     3     4     5     0     0
     0     0     0     1     2     3     4     5     0
     0     0     0     0     1     2     3     4     5
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