MATLAB: How to Assemble the matrix shown in the image on Matlab for any number of nodes

Best Answer

n = 4;    %for example
main_diagonal = [ [-4, repmat(-3,1,n-2), -4], repmat([-5, repmat(-4,1,n-2), -5], 1, 2), [-6, repmat(-5,1,n-2), -6] ];
N = length(main_diagonal);
m = diag(ones(1, N-4), -4) +
    diag(ones(1, N-1), -1) +
    diag(main_diagonal) +
    diag(ones(1, N-1), 1) +
    diag(ones(1, N-4), -4)
Related Question