dynSeries: making possible to concatanate empty series; fixing bugs

matlab/@dynSeries/horzcat.m

@@ -58,11 +58,11 @@ function a = horzcat(varargin)
 
 % Original author: stephane DOT adjemian AT univ DASH lemans DOT fr
 
-if nargin==0 || nargin==1
-    error('dynSeries::horzcat: I need at least two input arguments!')
-end
-
-if nargin==2
+if nargin==0 
+    a = DynSeries();
+elseif nargin == 1
+    a = varargin{1};
+elseif nargin==2
     a = horzcat2(varargin{1},varargin{2});
 else
     a = horzcat2(varargin{1},varargin{2});

matlab/@dynSeries/private/horzcat2.m

@@ -108,5 +108,6 @@ else
         c.data = [c.data; NaN(b_last_date-c_last_date,c.vobs)];
     end
     a.data = [b.data, c.data];
-    a.time = unique([b.time, c.time]);
-end
\ No newline at end of file
+    a.time = unique(b.time.append(c.time));
+end
+a.nobs = size(a.data,1);
\ No newline at end of file