--- /dev/null
+## Copyright (C) 2010 VZLU Prague
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn{Function File} {[@var{y}, @var{f}] = } nze (@var{x})
+## Extract nonzero elements of @var{x}. Equivalent to @code{@var{x}(@var{x} != 0)}.
+## Optionally, returns also linear indices.
+## @end deftypefn
+
+## Author: Etienne Grossmann <etienne@cs.uky.edu>
+## Author: Jaroslav Hajek <highegg@gmail.com>
+
+function [y, f] = nze (x)
+ nz = x != 0;
+ y = x(nz);
+ if (nargout > 1)
+ f = find (nz);
+ endif
+endfunction