Help me in Matlab. (plz edit my code)

This is my code:

A= xlsread('C:\Users\Tan Huu\Documents\MATLAB\1.xlsx');
U=textdata(:,1);
V=U';
Y=V(2:length(V));
Y(:);
B=zeros(length(A(:,1)));
for i=1:(length(A(:,1))-1)
   for j=(1+1):length(A(:,1))
   B(i,j)=distance(A(i,:),A(j,:));
B(j,i)=B(i,j);
   end
end
B(:);
C=squareform(B);
D=linkage(C,'single');
X=Y;
dendrogram(D,'labels',X)

and left of this image is input Matrix right of this image is result http://i306.photobucket.com/albums/nn247/tanbk/Matlab.png

My question is: Why my result not begin form 1 which from 8.5?