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diff --git a/octave_packages/tsa-4.2.4/flag_implicit_samplerate.m b/octave_packages/tsa-4.2.4/flag_implicit_samplerate.m
new file mode 100644
index 0000000..4491bed
--- /dev/null
+++ b/octave_packages/tsa-4.2.4/flag_implicit_samplerate.m
@@ -0,0 +1,64 @@
+function DIM=flag_implicit_samplerate(i)
+% The use of FLAG_IMPLICIT_SAMPLERATE is in experimental state. 
+% FLAG_IMPLICIT_SAMPLERATE might even become obsolete.
+% Do not use it. 
+
+% FLAG_IMPLICIT_SAMPLERATE sets and gets default mode for handling NaNs
+% The default DIM argument is stored in the global variable FLAG_implicit_samplerate
+% The idea is that the DIM-argument is not necessary. This might enable 
+% more readable code. 
+% 
+%   flag_implicit_samplerate(0) 
+%	calculation along first non-singleton dimension
+%   flag_implicit_samplerate(1) 
+%	calculation along columns
+%   flag_implicit_samplerate(2) 
+%	calculation along rows
+% 
+% DIM = flag_implicit_samplerate()
+% 	gets default mode
+%
+% flag_implicit_samplerate(DIM)
+% 	sets default DIM
+%
+% DIM = flag_implicit_samplerate(DIM)
+%	gets and sets DIM 
+%
+% features:
+% - compatible to Matlab and Octave
+%
+% see also: SINVEST1
+
+%	$Id: flag_implicit_samplerate.m 5090 2008-06-05 08:12:04Z schloegl $
+%	Copyright (C) 2000-2002,2008 by Alois Schloegl <a.schloegl@ieee.org>	
+%
+%    This program 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.
+%
+%    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+global FLAG_implicit_samplerate;
+
+%%% check whether FLAG was already defined 
+if exist('FLAG_implicit_samplerate')~=1,
+	FLAG_implicit_samplerate = 1;
+end;
+if isempty(FLAG_implicit_samplerate),
+	FLAG_implicit_samplerate = 1;
+end;
+
+if nargin>0,
+        fprintf(2,'Warning: FLAG_IMPLICIT_SAMPLERATE is in an experimental state\n');
+        fprintf(2,'It might become obsolete.\n');
+        FLAG_implicit_samplerate = i; 
+end;    
+
+DIM = FLAG_implicit_samplerate;