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diff --git a/octave_packages/m/general/issquare.m b/octave_packages/m/general/issquare.m
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+## Copyright (C) 1996-2012 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 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} {} issquare (@var{x})
+## Return true if @var{x} is a square matrix.
+## @seealso{isscalar, isvector, ismatrix, size}
+## @end deftypefn
+
+## Author: A. S. Hodel <scotte@eng.auburn.edu>
+## Created: August 1993
+## Adapted-By: jwe
+
+function retval = issquare (x)
+
+  if (nargin != 1)
+    print_usage ();
+  endif
+
+  if (ndims (x) == 2)
+    [r, c] = size (x);
+    retval = r == c;
+  else
+    retval = false;
+  endif
+
+endfunction
+
+%!assert(issquare ([]));
+%!assert(issquare (1));
+%!assert(!(issquare ([1, 2])));
+%!assert(issquare ([1, 2; 3, 4]));
+%!assert(!(issquare ([1, 2; 3, 4; 5, 6])));
+%!assert(!(issquare (ones (3,3,3))));
+%!assert(issquare ("t"));
+%!assert(!(issquare ("test")));
+%!assert(issquare (["test"; "ing"; "1"; "2"]));
+%!test
+%! s.a = 1;
+%! assert(issquare (s));
+%!assert(issquare ({1, 2; 3, 4}));
+%!assert(sparse (([1, 2; 3, 4])));
+
+%% Test input validation
+%!error issquare ();
+%!error issquare ([1, 2; 3, 4], 2);
+