how to write the result as matrix

hello, I have the following code gave me that PA and PT as vectors ,my question how to save data PA and PT in form matrix of 220 columns

    NC=16;
PA=[];
PT=[];
for n=1:NC
   for t=1:220
%for t=S
      tt = logical(masquea(:,:,n));
      tt = tt(:); 
      ff=logical(masquet(:,:,n));
      ff=ff(:);
        Im=HYPERD(:,:,t);
        Im=Im(:);

        PA = [PA;Im(tt)];%%the problem arises in this line
        PT=[PT;Im(ff)];      
 end

end end

Answer 1

[Matt J]

No need to loop over t:

 PA=reshape(HYPERD(:,:,tt),[],220);
 PT=reshape(HYPERD(:,:,ff),[],220);