I am trying to create this matrix ; How can i do this using for loops or without loops?

A=[1 1 1 0 0 0 0 0 0; 1 1 1 1 1 1 0 0 0 ; 1 1 1 1 1 1 1 1 1 ];

Answer 1

[Voss]

Here's one way without loops (just typing the matrix out):

A=[1 1 1 0 0 0 0 0 0; 1 1 1 1 1 1 0 0 0 ; 1 1 1 1 1 1 1 1 1 ];

But I guess that's not what you're looking for.

Maybe this instead:

N = 3;
A_1 = repelem(cummax(eye(N)),1,N)

A_1 = 3×9

1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 1 1

isequal(A,A_1) % check

ans = logical
   1

Or this:

A_2 = zeros(N,N^2);
for ii = 1:N
    A_2(ii,1:N*ii) = 1;
end
A_2

A_2 = 3×9

1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 1 1

isequal(A,A_2) % check

ans = logical
   1

[Obinna Mbadozie]

Thank you. That's exactly what I was looking for.

[Voss]

You're welcome!