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diff --git a/octave_packages/m/miscellaneous/symvar.m b/octave_packages/m/miscellaneous/symvar.m
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+## Copyright (C) 2008-2012 David Bateman
+##
+## 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} {} symvar (@var{s})
+## Identify the argument names in the function defined by a string.
+## Common constant names such as @code{pi}, @code{NaN}, @code{Inf},
+## @code{eps}, @code{i} or @code{j} are ignored.  The arguments that are
+## found are returned in a cell array of strings.  If no variables are
+## found then the returned cell array is empty.
+## @end deftypefn
+
+function args = symvar (s)
+  args = argnames (inline (s));
+endfunction
+
+## This function is tested by the tests for argnames().
+%!assert (1)