MATLAB: How to take square roots of certain entries of a tridiagonal matrix

So I have a 50 by 50 tridiagonal matrix. The entries along the main diagonal are 0 and the entries above and below are -square root (k(N-k) where N is 50 and k is an integer from 1 to 50. I am completely new to matlab and have no programming experience. Can someone please help?

Best Answer

N = 50;
v = 1:N-1; %a 50x50 matrix only have 49 elements above and below diagonal
m = full(gallery('tridiag', -sqrt(v.*(N-v)), zeros(1, N), -sqrt(v.*(N-v))))
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