% Chooses a random number from x where x(i) has probability
% weights(i) of being chosen.
% For example, to choose an exponentially distributed random
% variable, you might do:
%       x=0:.1:20;
%       w=lambda*exp(-lambda*x);
%       r=randnum(w,x);
%
% NOTE: If weights does not sum to 1, it will be normalized
% so that it does.  It must be positive, though.
% r=randnum(weights,x);


function r=randnum(weights,x);

r=x(discrete_rv(weights));