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tf2sysl.m
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1999-03-05
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# Copyright (C) 1996 A. Scottedward Hodel
#
# 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, 675 Mass Ave, Cambridge, MA 02139, 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