Create Matrix Please Help Me

Hello please help me I need a answer this question.

Write separately the following patterns (a), (b) the MATLAB program codes that can be created for any N value entered by the user, given as an example for the n= 6 value.

Answer 1

[DGM]

This is one way

n = 6;

A = diag(1:n)

A = 6×6

1 0 0 0 0 0 0 2 0 0 0 0 0 0 3 0 0 0 0 0 0 4 0 0 0 0 0 0 5 0 0 0 0 0 0 6

[bx by] = meshgrid(n:-1:1);
B = triu(by) + tril(bx,-1)

B = 6×6

6 6 6 6 6 6 6 5 5 5 5 5 6 5 4 4 4 4 6 5 4 3 3 3 6 5 4 3 2 2 6 5 4 3 2 1