Building a big matrix

Hello people,

Does anyone know how to build a matrix like this one?

Thank you!

Answer 1

[Ameer Hamza]

Are you trying to create an upper tiangular matrix? Read about triu: https://www.mathworks.com/help/matlab/ref/triu.html

[Ricardo López]

That was useful, but I want to index it as shown in the picture. Any idea how?

[Ameer Hamza]

Are you trying to create something like this

H_alpha = [1 2 3 4];

M = zeros(numel(H_alpha));
for i = 1:numel(H_alpha)
    M = M + diag(H_alpha(i)*ones(numel(H_alpha)-i+1, 1), 1-i);
end

[Ricardo López]

Yeeees! Many thanks

[Ameer Hamza]

I am glad to be of help! :)