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+## Copyright (C) 2004 David Bateman & Andy Adler
+##
+## This program 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 of the License, or
+## (at your option) any later version.
+##
+## This program 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 this program; if not, write to the Free Software
+## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{y} =} spones (@var{x})
+## Replace the non-zero entries of @var{x} with ones. This creates a
+## sparse matrix with the same structure as @var{x}.
+## @end deftypefn
+
+function s = spones(s)
+  if issparse(s)
+    [i,j,v,m,n] = spfind(s);
+  else
+    [i,j,v] = find(s);
+    [m,n] = size(s);
+  end
+  s = 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]))