4*4 diagonally dominant matrix

Hello,

Im having trouble creating a diagonally dominant matrix. What command should i be using?

Thanks in advance!

[Daniel Pollard]

A diagonally dominant matrix is a pretty general thing. You could just call eye(4) and that would be (technically) diagonally dominant, although likely not that interesting.

What are you trying to do? What have you tried so far? Did you get any error messages, or unexpected outputs?

Answer 1

[David Hill]

If you want to randomly generate, I would just generate a random 4x4 and then check whether it was diagonally dominant.

a=randi(100,4)-50;
while nnz(sum(abs(a),2)-2*diag(abs(a))>0)
  a=randi(100,4)-50;
end