function randomstate = Generate(q)
% This function is used in the chapter on Markov Chain, weather condition 
% extracts one of the three states {1-clear, 2-cloudy, 3-rainy} from a distribution of
% discrete probability (vector q) of these states. 
%
 x  = rand(1,1);
 randomstate = 1;
 u = q(1);
 while u < x
    randomstate = randomstate + 1;
    u = u + q(randomstate);
 end
end