This is polyreduce.m in view mode; [Download] [Up]
## Copyright (C) 1996 John W. Eaton
##
## 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
## 02111-1307, USA.
## usage: polyreduce(c)
##
## Reduces a polynomial coefficient vector to a minimum number of terms,
## i.e. it strips off any leading zeros.
##
## SEE ALSO: poly, roots, conv, deconv, residue, filter, polyval, polyvalm,
## polyderiv, polyinteg
## Author: Tony Richardson <amr@mpl.ucsd.edu>
## Created: June 1994
## Adapted-By: jwe
function p = polyreduce (p)
if (nargin != 1)
usage ("polyreduce (p)");
endif
if (! (is_vector (p) || isempty (p)))
error ("polyreduce: argument must be a vector");
endif
if (! isempty (p))
index = find (p == 0);
if (length (index) != 0)
index = find (index == 1:length (index));
if (length (index) != 0)
if (length (p) > 1)
p = p (index (length (index))+1:length (p));
endif
if (length (p) == 0)
p = 0;
endif
endif
endif
endif
endfunction
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