maint: Use same coding style when checking for a minimum of 1 input. * disp.m, __get_properties__.m, disp.m, isplaying.m, pause.m, resume.m, stop.m, __get_properties__.m, disp.m, isrecording.m, pause.m, resume.m, stop.m, mu2lin.m, acosd.m, acot.m, acotd.m, acoth.m, acsc.m, acscd.m, acsch.m, asec.m, asecd.m, asech.m, asind.m, atand.m, cosd.m, cot.m, cotd.m, coth.m, csc.m, cscd.m, csch.m, sec.m, secd.m, sech.m, sind.m, tand.m, cell2mat.m, deg2rad.m, fliplr.m, flipud.m, int2str.m, nextpow2.m, num2str.m, rad2deg.m, subsindex.m, rotx.m, roty.m, rotz.m, voronoin.m, __unimplemented__.m, frame2im.m, hsv2rgb.m, iscolormap.m, __imfinfo__.m, rgb2gray.m, rgb2hsv.m, fileread.m, is_valid_file_id.m, usejava.m, argnames.m, char.m, formula.m, vectorize.m, isdir.m, vectorize.m, condeig.m, duplication_matrix.m, expm.m, isdiag.m, istril.m, istriu.m, normest.m, planerot.m, trace.m, vech.m, fieldnames.m, fileparts.m, grabcode.m, isfile.m, isfolder.m, mustBeFinite.m, mustBeInteger.m, mustBeNegative.m, mustBeNonNan.m, mustBeNonempty.m, mustBeNonnegative.m, mustBeNonpositive.m, mustBeNonsparse.m, mustBeNonzero.m, mustBeNumeric.m, mustBeNumericOrLogical.m, mustBePositive.m, mustBeReal.m, namedargs2cell.m, open.m, run.m, swapbytes.m, pareto.m, allchild.m, colstyle.m, hdl2struct.m, isaxes.m, isfigure.m, ishandle.m, compan.m, poly.m, polyreduce.m, ppjumps.m, roots.m, unmkpp.m, profexplore.m, profile.m, bartlett.m, fftshift.m, hurst.m, ifftshift.m, sinc.m, spencer.m, yulewalker.m, colperm.m, nonzeros.m, spconvert.m, spones.m, sprandsym.m, cosint.m, expint.m, factor.m, factorial.m, isprime.m, perms.m, primes.m, reallog.m, realsqrt.m, sinint.m, gallery.m, hadamard.m, hilb.m, invhilb.m, magic.m, wilkinson.m, center.m, iqr.m, meansq.m, median.m, runlength.m, bin2dec.m, blanks.m, deblank.m, hex2dec.m, isletter.m, isstring.m, str2num.m, strtrim.m, asctime.m, ctime.m: Replace "if (nargin != 1)" formulations with "if (nargin < 1)" to match the rest of Octave.

########################################################################
##
## Copyright (C) 1994-2020 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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 3 of the License, 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, see
## <https://www.gnu.org/licenses/>.
##
########################################################################

## -*- texinfo -*-
## @deftypefn {} {} polyreduce (@var{c})
## Reduce a polynomial coefficient vector to a minimum number of terms by
## stripping off any leading zeros.
## @seealso{polyout}
## @end deftypefn

function p = polyreduce (c)

  if (nargin < 1)
    print_usage ();
  elseif (! isvector (c) || isempty (c))
    error ("polyreduce: C must be a non-empty vector");
  endif

  idx = find (c != 0, 1);

  if (isempty (idx))
    p = 0;
  else
    p = c(idx:end);
  endif

endfunction


%!assert (polyreduce ([0, 0, 1, 2, 3]), [1, 2, 3])
%!assert (polyreduce ([1, 2, 3, 0, 0]), [1, 2, 3, 0, 0])
%!assert (polyreduce ([1, 0, 3]), [1, 0, 3])
%!assert (polyreduce ([0, 0, 0]), 0)

%!error <Invalid call> polyreduce ()
%!error <C must be a non-empty vector> polyreduce ([1, 2; 3, 4])
%!error <C must be a non-empty vector> polyreduce ([])