--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/general/issymmetric.m	Fri Aug 09 06:56:43 2002 +0000
@@ -0,0 +1,49 @@
+## Copyright (C) 1996, 1997 John W. Eaton
+##
+## 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 2, 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, write to the Free
+## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} issymmetric (@var{x}, @var{tol})
+## If @var{x} is symmetric within the tolerance specified by @var{tol},
+## then return the dimension of @var{x}.  Otherwise, return 0.  If
+## @var{tol} is omitted, use a tolerance equal to the machine precision.
+## @end deftypefn
+## @seealso{size, rows, columns, length, ismatrix, isscalar,
+## issquare, and isvector}
+
+## Author: A. S. Hodel <scotte@eng.auburn.edu>
+## Created: August 1993
+## Adapted-By: jwe
+
+function retval = issymmetric (x,tol)
+
+  if (nargin == 1 || nargin == 2)
+    retval = issquare (x);
+    if (retval != 0)
+      if (nargin == 1)
+        tol = eps;
+      endif
+      if (norm (x - x') / norm(x) > tol)
+        retval = 0;
+      endif
+    endif
+  else
+    usage ("issymmetric (x {,tol})");
+  endif
+
+endfunction