It is much cleaner to use fprintf. That way you can also much more easily insert more numbers to display:
function fib(n)
% Set the Fibonacci number to calculate.
% Create a row vector called containing n ones.
F = ones(1,n);
% This vector is used to store the Fibonacci
% numbers; its first element is currently F_1
% and its second element is F_2 (if n>1).
% If n>2, then use the recursive formula
% to calculate F_3, F_4, ... , F_n.
for k = 3:n
F(k) = F(k-1) + F(k-2);
fprintf('Fibonacci no. %d = %d\n',k,F(k));
end
end
