doc: Replace "non-zero" with "nonzero" to match existing usage. Replace all occurrences in both documentation and code comments. * doc/interpreter/contrib.txi, doc/interpreter/diagperm.txi, doc/interpreter/external.txi, doc/interpreter/sparse.txi, doc/interpreter/stmt.txi, doc/interpreter/testfun.txi, doc/refcard/refcard.tex, examples/mysparse.c, libinterp/corefcn/balance.cc, libinterp/corefcn/cellfun.cc, libinterp/corefcn/data.cc, libinterp/corefcn/filter.cc, libinterp/corefcn/find.cc, libinterp/corefcn/kron.cc, libinterp/corefcn/ls-mat5.cc, libinterp/corefcn/luinc.cc, libinterp/corefcn/mappers.cc, libinterp/corefcn/oct-fstrm.cc, libinterp/corefcn/oct-fstrm.h, libinterp/corefcn/oct-iostrm.cc, libinterp/corefcn/oct-iostrm.h, libinterp/corefcn/oct-stdstrm.h, libinterp/corefcn/oct-strstrm.h, libinterp/corefcn/spparms.cc, libinterp/corefcn/toplev.cc, libinterp/corefcn/utils.cc, libinterp/dldfcn/symrcm.cc, libinterp/octave-value/ov-bool-mat.cc, liboctave/array/CSparse.cc, liboctave/array/Sparse.cc, liboctave/array/Sparse.h, liboctave/array/dSparse.cc, liboctave/numeric/randmtzig.c, liboctave/operators/Sparse-op-defs.h, scripts/help/get_first_help_sentence.m, scripts/miscellaneous/edit.m, scripts/plot/draw/pie.m, scripts/plot/draw/pie3.m, scripts/sparse/colperm.m, scripts/sparse/nonzeros.m, scripts/sparse/spdiags.m, scripts/sparse/spfun.m, scripts/sparse/spones.m, scripts/sparse/sprand.m, scripts/sparse/sprandn.m, scripts/sparse/sprandsym.m, scripts/sparse/spstats.m, scripts/sparse/svds.m, scripts/special-matrix/gallery.m, scripts/statistics/base/moment.m, scripts/statistics/tests/cor_test.m: Replace "non-zero" with "nonzero" to match existing usage.

## Copyright (C) 2004-2013 David Bateman and Andy Adler
##
## 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
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {Function File} {@var{r} =} spones (@var{S})
## Replace the nonzero entries of @var{S} with ones.  This creates a
## sparse matrix with the same structure as @var{S}.
## @seealso{sparse, sprand, sprandn, sprandsym, spfun, spy}
## @end deftypefn

function r = spones (S)

  if (nargin != 1)
    print_usage ();
  endif

  [i, j, v] = find (S);
  [m, n] = size (S);

  r = sparse (i, j, 1, m, n);

endfunction


%!assert (issparse (spones ([1,2;3,0])))
%!assert (spones ([1,2;3,0]), sparse ([1,1;1,0]))
%!assert (spones (sparse ([1,2;3,0])), sparse ([1,1;1,0]))