Added @dynDates/isempty function.

matlab/@dynDates/dynDates.m

@@ -60,13 +60,13 @@ function dd = dynDates(varargin)
 % 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/>.
+ % along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 
 dd = struct;
 
 dd.ndat = 0;
-dd.freq = [];
-dd.time = [];
+dd.freq = NaN;
+dd.time = NaN(1,2);
 
 dd = class(dd,'dynDates');
 

matlab/@dynDates/isempty.m

+function B = isempty(A)
+
+%@info:
+%! @deftypefn {Function File} {@var{B} =} isempty (@var{A})
+%! @anchor{@dynDates/isempty}
+%! @sp 1
+%! Overloads the isempty function for the @ref{dynDates} class.
+%! @sp 2
+%! @strong{Inputs}
+%! @sp 1
+%! @table @ @var
+%! @item A
+%! @ref{dynDates} object.
+%! @end table
+%! @sp 1
+%! @strong{Outputs}
+%! @sp 1
+%! @table @ @var
+%! @item b
+%! Integer scalar (equal to zero if @var{A} is not empty).
+%! @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/>.
+    
+B = all(isnan(A.time)) && isnan(A.freq) && isequal(A.ndat,0);
+
+%@test:1
+%$ % Instantiate an empty dynDate object
+%$ d = dynDates();
+%$ % Test if this object is empty
+%$ t(1) = isempty(d);
+%$ T = all(t);
+%@eof:1
\ No newline at end of file