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diff --git a/octave_packages/nan-2.5.5/iqr.m b/octave_packages/nan-2.5.5/iqr.m
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+function Q=iqr(Y,DIM)
+% IQR calculates the interquartile range  
+%  Missing values (encoded as NaN) are ignored. 
+%
+%  Q = iqr(Y)
+%  Q = iqr(Y,DIM)
+%     returns the IQR along dimension DIM of sample array Y.
+%
+%  Q = iqr(HIS)
+%     returns the IQR from the histogram HIS. 
+%     HIS must be a HISTOGRAM struct as defined in HISTO2 or HISTO3.
+%
+% see also: MAD, RANGE, HISTO2, HISTO3, PERCENTILE, QUANTILE
+
+
+%	$Id$
+%	Copyright (C) 2009 by Alois Schloegl <alois.schloegl@gmail.com>	
+%       This function is part of the NaN-toolbox
+%       http://pub.ist.ac.at/~schloegl/matlab/NaN/
+
+%    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/>.
+
+if nargin<2,
+        DIM = [];
+end;
+if isempty(DIM),
+        DIM = min(find(size(Y)>1));
+        if isempty(DIM), DIM = 1; end;
+end;
+
+
+if nargin<1,
+	help iqr
+        
+else
+	Q = quantile(Y,[1,3]/4,DIM); 
+	Q = diff(Q,[],DIM); 
+end;
+
+
+