How to create a matrix with a for- loop

Hi, i'm trying to create a matrix using a for-loop and conditional.

I want to create

B= 1 1 1

0 0 0

1 1 1

Answer 1

[KSSV]

A = zeros(3) ; 
A(1,:) = 1 ;
A(3,:) = 1 ;
A

A = 3×3

1 1 1 0 0 0 1 1 1

Answer 2

[Amit Bhowmick]

Check with this

n=3;
B=zeros(n);
for ii=1:n
    for jj=1:n
        B(ii,jj)=rem(ii,2);
    end
end