function rangev=rvrange(X) 
% rvrange(X)  generates a column vector from a random variable matrix 
%             containing the range of values from each experiment 
M=size(X); 
rangev=zeros(M(1), 1); 
for i=1:M(1); 
   rangev(i)=max(X(i,:))-min(X(i,:)); 
end