I reshaped the image elements into 16*1 column vector using the following code. There is 16 vectors in variable (tv). Now i need to retrieve the first vector of variable (tv). ie, i need tv(1), tv(2)... tv(16)Please say the code.

for i=1:4:16

    for j=1:4:16

      block=I(i:i+3,j:j+3);

      disp(block)
      %convert 4X4 into 16X1 column vector
      tv=reshape(block,16,1);
      disp(tv)
column=column+4;

   end

   row=row+4;

end