How to create a matrix?

2016 4 2
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Hi all, I am trying to create a matrix (101x101) like this :
Can anyone help me with the code please?

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Azzi Abdelmalek
Azzi Abdelmalek 2016-4-2
编辑：Azzi Abdelmalek 2016-4-2

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n=4 % in your case use n=101
out=tril(2*ones(n),-1)

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jack star
jack star 2016-4-2
Thank you very much for your answer.
Now I'm trying to solve this matrix:
Y= U x g
% Y(101x1) and U(101x101) matrixes.
to find g, i used this g = inv(U)*Y
But it found g(101x1) NaN matrix. You have any idea why?

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