How to stop processing futher code when a condition is met

Hi! How can I stop this script from processing code when F(k-1) is less than or equal to zero, and instead get a message ('the rabbits are instinct')

n = 100;        
terskelverdi = 0.1;
F = zeros(n,1);
F(1) = 1;
F(2) = 1;
for   k = 3:n;
      r = rand(1);
      if r > terskelverdi
      F(k) = F(k-1) + F(k-2);
      else 
      F(k) = F(k-1) - F(k-2);
      end
end

Answer 1

[Adam]

Just put the condition at an appropriate place in your loop where you want to do the test:

if F(k-1) <= 0
   disp( 'the rabbits are instinct' );
   break
end