N = 5;
% start with a matrix of all 3's
% (then the code will place 2's at the appropriate places)
Y = 3*ones(N);
% loop over all rows (in general, every row gets
% a 2 somewhere, not just the odd rows):
for i = 1:N
% determine which column the first 2 goes in:
% odd i: start in column 1 (e.g., row 1 has a 2 in column 1)
% even i: start in column 2 (e.g., row 2 has a 2 in column 2)
start_column = 2-mod(i,2);
% place 2's in each alternate column of row i, starting with
% start_column:
for j = start_column:2:N
Y(i,j) = 2;
end
end
disp(Y);
