Added new routine.

matlab/isquare.m

+function info = isquare(A)
+
+%@info:
+%! @deftypefn {Function File} {@var{info} =} isquare (@var{A})
+%! @anchor{isquare}
+%! @sp 1
+%! Tests if @var{A} is square matrix.
+%! @sp 2
+%! @strong{Inputs}
+%! @sp 1
+%! @table @ @var
+%! @item A
+%! Matlab's array.
+%! @end table
+%! @sp 2
+%! @strong{Outputs}
+%! @sp 1
+%! @table @ @var
+%! @item info
+%! Integer scalar equal to 1 if @var{A} is a square matrix, 0 otherwise.
+%! @end table
+%! @end deftypefn
+%@eod:
+
+% Copyright (C) 2013 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare 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.
+%
+% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.
+
+info = 0;
+if isequal(ndims(A),2) && isequal(size(A,1),size(A,2))
+    info = 1;
+end
\ No newline at end of file