diff --git a/matlab/@dynDates/size.m b/matlab/@dynDates/size.m
new file mode 100644
index 000000000..8fb6b8e55
--- /dev/null
+++ b/matlab/@dynDates/size.m
@@ -0,0 +1,20 @@
+function a = size(b)
+
+% 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/>.
+
+a = b.ndat;
\ No newline at end of file
diff --git a/matlab/@dynSeries/size.m b/matlab/@dynSeries/size.m
new file mode 100644
index 000000000..efc28e7a5
--- /dev/null
+++ b/matlab/@dynSeries/size.m
@@ -0,0 +1,21 @@
+function [a,b] = size(c)
+
+% 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/>.
+
+a = c.nobs;
+b = c.vobs;
\ No newline at end of file