how i can solve this proplem

hello all; the xapp vector is not working with the inner loop, i mean is not taking the appropriate value which was 12345.... until 9.

dec_firlet=[1,3,13,13,19,5,19,1,9,11,7,15,7,11,5,13,4,15,6,3,7,6,9,18,15,19,17,20,24,1,8,20,18,15,10]
  dif_number=length(dec_firlet)
  [vr,vc]=size(dec_firlet);
  for wcol=1:vc
      if( wcol<27)
          Firlettm{1,wcol}=sqralph(dec_firlet(1,wcol),wcol);             
      else
      dfg=wcol-26
      for xapp=dfg:dif_number-26     
      Firlettm{1,wcol}=sqralph(dec_firlet(1,wcol),xapp);   
      end     
      end
  end