Changed the behaviour of the unique method...

As in commit 6beaf7b0 (for the sort method).

src/@dates/subsref.m

@@ -36,7 +36,7 @@ switch S(1).type
             error(['dates::subsref: ' S(1).subs ' is not a method but a member!'])
         end
         B = builtin('subsref', A, S(1));
-      case {'sort','sort_','unique','double','isempty','length','char','ndat'}% Public methods (without input arguments)
+      case {'sort','sort_','unique','unique_','double','isempty','length','char','ndat'}% Public methods (without input arguments)
         B = feval(S(1).subs,A);
         if length(S)>1 && isequal(S(2).type,'()') && isempty(S(2).subs)
            S = shiftS(S,1);

src/@dates/unique.m

@@ -30,13 +30,8 @@ if o.ndat()<=1
     return
 end
 
-if isoctave || matlab_ver_less_than('8.1.0')
-    [tmp, id, jd] = unique(o.time,'rows');
-else
-    [tmp, id, jd] = unique(o.time,'rows','legacy');
-end
-
-o.time = o.time(sort(id),:);
+o = copy(o);
+o.unique_();
 
 %@test:1
 %$ % Define some dates
@@ -49,14 +44,80 @@ o.time = o.time(sort(id),:);
 %$ % Define expected results.
 %$ e.time = [1953 4; 1950 1; 1945 3; 1950 2];
 %$ e.freq = 4;
+%$ f.time = [1953 4; 1950 2; 1950 1; 1945 3; 1950 2];
 %$
 %$ % Call the tested routine.
 %$ d = dates(B1,B2,B3,B4,B5);
-%$ d = d.unique();
+%$ try
+%$     c = d.unique();
+%$     t(1) = true;
+%$ catch
+%$     t(1) = false;
+%$ end
 %$ 
 %$ % Check the results.
-%$ t(1) = dassert(d.time,e.time);
-%$ t(2) = dassert(d.freq,e.freq);
-%$ t(3) = size(e.time,1) == d.ndat();
+%$ if t(1)
+%$     t(2) = dassert(d.time,f.time);
+%$     t(3) = dassert(c.time,e.time);
+%$     t(4) = dassert(d.freq,e.freq);
+%$ end
 %$ T = all(t);
 %@eof:1
+
+%@test:2
+%$ % Define some dates
+%$ B1 = '1953Q4';
+%$ B2 = '1950Q2';
+%$ B3 = '1950q1';
+%$ B4 = '1945Q3';
+%$ B5 = '1950Q2'; 
+%$
+%$ % Define expected results.
+%$ e.time = [1953 4; 1950 1; 1945 3; 1950 2];
+%$ e.freq = 4;
+%$ f.time = [1953 4; 1950 2; 1950 1; 1945 3; 1950 2];
+%$
+%$ % Call the tested routine.
+%$ d = dates(B1,B2,B3,B4,B5);
+%$ try
+%$     c = unique(d);
+%$     t(1) = true;
+%$ catch
+%$     t(1) = false;
+%$ end
+%$ 
+%$ % Check the results.
+%$ if t(1)
+%$     t(2) = dassert(d.time,f.time);
+%$     t(3) = dassert(c.time,e.time);
+%$     t(4) = dassert(d.freq,e.freq);
+%$ end
+%$ T = all(t);
+%@eof:2
+
+%@test:3
+%$ % Define some dates
+%$ B1 = '1953Q4';
+%$
+%$ % Define expected results.
+%$ e.time = [1953 4];
+%$ e.freq = 4;
+%$ f.time = e.time;
+%$
+%$ % Call the tested routine.
+%$ d = dates(B1);
+%$ try
+%$     c = d.unique();
+%$     t(1) = true;
+%$ catch
+%$     t(1) = false;
+%$ end
+%$ 
+%$ % Check the results.
+%$ if t(1)
+%$     t(2) = dassert(d.time,f.time);
+%$     t(3) = dassert(c.time,e.time);
+%$     t(4) = dassert(d.freq,e.freq);
+%$ end
+%$ T = all(t);
+%@eof:3

src/@dates/unique_.m

+function o = unique_(o) % --*-- Unitary tests --*--
+
+% Overloads the unique function for dates objects (in place modification).
+%
+% INPUTS 
+% - o [dates]
+%
+% OUPUTS 
+% - o [dates]
+%
+% REMARKS 
+% 1. Only the last occurence of a date is kept.
+
+% Copyright (C) 2013-2015 Dynare Team
+%
+% This code 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 dates submodule 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 o.ndat()<=1
+    return
+end
+
+if isoctave || matlab_ver_less_than('8.1.0')
+    [tmp, id, jd] = unique(o.time,'rows');
+else
+    [tmp, id, jd] = unique(o.time,'rows','legacy');
+end
+
+o.time = o.time(sort(id),:);
+
+%@test:1
+%$ % Define some dates
+%$ B1 = '1953Q4';
+%$ B2 = '1950Q2';
+%$ B3 = '1950q1';
+%$ B4 = '1945Q3';
+%$ B5 = '1950Q2'; 
+%$
+%$ % Define expected results.
+%$ e.time = [1953 4; 1950 1; 1945 3; 1950 2];
+%$ e.freq = 4;
+%$
+%$ % Call the tested routine.
+%$ d = dates(B1,B2,B3,B4,B5);
+%$ try
+%$     d.unique_();
+%$     t(1) = true;
+%$ catch
+%$     t(1) = false;
+%$ end
+%$ 
+%$ % Check the results.
+%$ if t(1)
+%$     t(2) = dassert(d.time,e.time);
+%$     t(3) = dassert(d.freq,e.freq);
+%$ end
+%$ T = all(t);
+%@eof:1
+
+%@test:1
+%$ % Define some dates
+%$ B1 = '1953Q4';
+%$ B2 = '1950Q2';
+%$ B3 = '1950q1';
+%$ B4 = '1945Q3';
+%$ B5 = '1950Q2'; 
+%$
+%$ % Define expected results.
+%$ e.time = [1953 4; 1950 1; 1945 3; 1950 2];
+%$ e.freq = 4;
+%$
+%$ % Call the tested routine.
+%$ d = dates(B1,B2,B3,B4,B5);
+%$ try
+%$     unique_(d);
+%$     t(1) = true;
+%$ catch
+%$     t(1) = false;
+%$ end
+%$ 
+%$ % Check the results.
+%$ if t(1)
+%$     t(2) = dassert(d.time,e.time);
+%$     t(3) = dassert(d.freq,e.freq);
+%$ end
+%$ T = all(t);
+%@eof:1
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