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/usr/share/octave/packages/nan-2.5.9/prctile.m is in octave-nan 2.5.9-2.

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function Q=prctile(Y,q,DIM)
% PRCTILE calculates the percentiles of histograms and sample arrays.  
% (its the same than PERCENTILE.M)
%
%  Q = prctile(Y,q)      
%  Q = prctile(Y,q,DIM)      
%     returns the q-th percentile along dimension DIM of sample array Y.
%     size(Q) is equal size(Y) except for dimension DIM which is size(Q,DIM)=length(Q)
%
%  Q = prctile(HIS,q)
%     returns the q-th percentile from the histogram HIS. 
%     HIS must be a HISTOGRAM struct as defined in HISTO2 or HISTO3.
%     If q is a vector, the each row of Q returns the q(i)-th percentile 
%
% see also: HISTO2, HISTO3, QUANTILE

%	$Id$
%	Copyright (C) 1996-2003,2005,2006,2007,2009 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 2 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,
	Q = quantile(Y,q/100); 

elseif nargin==3,
	Q = quantile(Y,q/100,DIM); 

else
	help percentile

end;