# 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. 
 
function vec = tf2sysl(vec)
# vec = tf2sysl(vec)
#
# used internally in tf2sys
# strip leading zero coefficients to get the true polynomial length


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