Added @dynDates/intersect function.

matlab/@dynDates/intersect.m

+function C = intersect(A,B)
+
+%@info:
+%! @deftypefn {Function File} {@var{C} =} intersect (@var{A},@var{B})
+%! @anchor{@dynDates/intersect}
+%! @sp 1
+%! C of B and A.
+%! if A and B are not disjoints.
+%! @sp 2
+%! @strong{Inputs}
+%! @sp 1
+%! @table @ @var
+%! @item A
+%! @ref{dynDates} object.
+%! @item B
+%! @ref{dynDates} object.
+%! @end table
+%! @sp 2
+%! @strong{Outputs}
+%! @sp 1
+%! @table @ @var
+%! @item C
+%! @ref{dynDates} object.
+%! @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/>.
+
+if ~isa(A,'dynDates') || ~isa(B,'dynDates')
+    error(['dynDates::plus: Input arguments ''' inputname(1) ''' and ''' inputname(2) ''' must be dynDates objects!'])
+end
+
+if eq(A,B)
+    C = A;
+    return
+end
+
+if ~isequal(A.freq,B.freq)
+    C = dynDates();
+    return
+end
+
+[tmp,ia,ib] = intersect(A.time,B.time,'rows');
+
+C = dynDates();
+if isempty(tmp)
+    return
+end
+
+C.freq = A.freq;
+C.time = tmp;
+C.ndat = rows(tmp); 
+
+%@test:1
+%$ % Define some dynDates objects
+%$ d1 = dynDate('1950Q1'):dynDate('1969Q4') ;
+%$ d2 = dynDate('1960Q1'):dynDate('1969Q4') ;
+%$ d3 = dynDate('1970Q1'):dynDate('1979Q4') ;
+%$
+%$ % Call the tested routine.
+%$ c1 = intersect(d1,d2);
+%$ c2 = intersect(d1,d3);
+%$
+%$ % Check the results.
+%$ t(1) = dyn_assert(c1==d2,1);
+%$ t(2) = dyn_assert(isempty(c2),1);
+%$ T = all(t);
+%@eof:1
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