Added checks for octave and matlab version.

Behaviour of unique has changed after R2012b. We force the old behaviour to keep compatibility with Octave's implementation of the unique function.

Also removed useless condition.

matlab/@dates/unique.m

@@ -6,7 +6,7 @@ function B = unique(A) % --*-- Unitary tests --*--
 %  o A    dates object.
 %
 % OUTPUTS 
-%  o B    dates object (a copy of A without repetitions).
+%  o B    dates object (a copy of A without repetitions, only the last occurence of a date is kept).
 
 % Copyright (C) 2012-2013 Dynare Team
 %
@@ -25,17 +25,18 @@ function B = unique(A) % --*-- Unitary tests --*--
 % 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,'dates')
-    error(['dates::unique: Input argument ' inputname(1) ' has to be a dates object.'])
-end
-
-if A.ndat==1
+if isequal(A.ndat,1)
     return
 end
 
 B = A;
 
-[tmp,id,jd] = unique(A.time,'rows');
+if isoctave || matlab_ver_less_than('8.1.0')
+    [tmp, id, jd] = unique(A.time,'rows');
+else
+    [tmp, id, jd] = unique(A.time,'rows','legacy');
+end
+
 B.time = A.time(sort(id),:);
 B.ndat = size(B.time,1);
 
@@ -48,13 +49,13 @@ B.ndat = size(B.time,1);
 %$ B5 = '1950Q2'; 
 %$
 %$ % Define expected results.
-%$ e.time = [1953 4; 1950 2; 1950 1; 1945 3];
+%$ e.time = [1953 4; 1950 1; 1945 3; 1950 2];
 %$ e.freq = 4;
 %$ e.ndat = 4;
 %$
 %$ % Call the tested routine.
 %$ d = dates(B1,B2,B3,B4,B5);
-%$ d = d.unique;
+%$ d = d.unique(); d, d.time, e.time
 %$ 
 %$ % Check the results.
 %$ t(1) = dyn_assert(d.time,e.time);