I have a Do While Loop error while doing a statistical calculation, how can I fix this?

So I'm trying to do a principle component analysis using the NIPALS algorithim. I have been writing my own version in Matlab, and I got it to run but I'm not sure it's working properly. I tested it on a small 6x6 matrix "A" but I would just get back weird values in the T score plot like 1's and 0's, but sometimes I got a 1.4? I was wondering if I did anything wrong, or if this is okay.

function[T, P]=nipals()

A = [8 8 6 7 6 5; 8 8 3 4 3 2]; %Normalize Original Matrix X=zscore(A); T=zeros(6,3); %observations P=zeros(6,3); %variables tolerance=1e-6

%Finding 3 T Scores and Principal Components for k = 1:3

%Extract First T Score, first column from X
T=X(:,1);
check = false;
i=0;

while(~check)
    i=i+1;
    %Calculate P Vector
    P=(X'*T)/(T'*T);
    %Normalizing the P Vector
    P=P/norm(P);
    %Calculating New T Score
    Tnew=(X*P)/(P'*P);
    difference=(Tnew-T)'*(Tnew-T);
    T=Tnew;

          if difference <= tolerance^2
              check = true;
          end

end

T(:,k) = Tnew;
P(:,k) = P;

end