MATLAB: How to write pentadigonal matix

penta diagonal matrix

How to generate the following penta diagonal matrix in matlab?

Best Answer

Is it good now?
n = 12;
m = ceil(n / 3);
n = m*3;
A = spdiags([1 -4 1]+zeros(3,1), -1:1, 3, 3);
c = repmat({A},1,m);
A = blkdiag(c{:});
A = A + spdiags([1 1]+zeros(n,1), [-3 3], n, n);
full(A)
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