--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/control/system/__tf2sysl__.m	Fri Jan 14 06:00:04 2000 +0000
@@ -0,0 +1,35 @@
+## Copyright (C) 1996 Auburn University.  All rights reserved.
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by the
+## Free Software Foundation; either version 2, or (at your option) any
+## later version.
+##
+## Octave is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+## for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, write to the Free
+## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{vec} =} tf2sysl (@var{vec})
+## used internally in @ref{tf2sys}.
+## strip leading zero coefficients to get the true polynomial length
+## @end deftypefn
+
+function vec = tf2sysl (vec)
+
+  while( (length(vec) > 1) & (vec(1) == 0) )
+    vec = vec(2:length(vec));
+  endwhile
+
+  if(vec(1) == 0)
+    warning("tf2sys: polynomial has no nonzero coefficients!")
+  endif
+
+endfunction