X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;f=octave_packages%2Fnan-2.5.5%2Fmedian.m;fp=octave_packages%2Fnan-2.5.5%2Fmedian.m;h=bcaa742a2094c6743a70f2ba5a72f82e6414042d;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hp=0000000000000000000000000000000000000000;hpb=1705066eceaaea976f010f669ce8e972f3734b05;p=CreaPhase.git
diff --git a/octave_packages/nan-2.5.5/median.m b/octave_packages/nan-2.5.5/median.m
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+function [y]=median(x,DIM)
+% MEDIAN data elements,
+% [y]=median(x [,DIM])
+%
+% DIM dimension
+% 1: median of columns
+% 2: median of rows
+% N: median of N-th dimension
+% default or []: first DIMENSION, with more than 1 element
+%
+% features:
+% - can deal with NaN's (missing values)
+% - accepts dimension argument like in Matlab in Octave, too.
+% - compatible to Matlab and Octave
+%
+% see also: SUMSKIPNAN
+
+% 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 .
+
+% $Id: median.m 9033 2011-11-08 20:58:07Z schloegl $
+% Copyright (C) 2000-2003,2009 by Alois Schloegl
+% This function is part of the NaN-toolbox
+% http://pub.ist.ac.at/~schloegl/matlab/NaN/
+
+global FLAG_NANS_OCCURED;
+
+% check dimension of x
+sz=size(x);
+
+% find the dimension for median
+if nargin<2,
+ DIM=min(find(sz>1));
+ if isempty(DIM), DIM=1; end;
+end;
+
+if DIM>length(sz),
+ sz = [sz,ones(1,DIM-length(sz))];
+end;
+
+D1 = prod(sz(1:DIM-1));
+D2 = sz(DIM);
+D3 = prod(sz(DIM+1:length(sz)));
+D0 = [sz(1:DIM-1),1,sz(DIM+1:length(sz))];
+y = repmat(nan,D0);
+flag_MexKthElement = exist('kth_element','file')==3;
+
+for k = 0:D1-1,
+for l = 0:D3-1,
+ xi = k + l * D1*sz(DIM) + 1 ;
+ xo = k + l * D1 + 1;
+ t = x(xi+(0:sz(DIM)-1)*D1);
+ t = t(~isnan(t));
+ n = length(t);
+
+ if n==0,
+ y(xo) = nan;
+ elseif flag_MexKthElement,
+ if (D1==1) t = t+0.0; end; % make sure a real copy (not just a reference to x) is used
+ flag_KthE = 0; % fast kth_element can be used, because t does not contain any NaN and there is need to care about in-place sorting
+ if ~rem(n,2),
+ y(xo) = sum( kth_element( double(t), n/2 + [0,1], flag_KthE) ) / 2;
+ elseif rem(n,2),
+ y(xo) = kth_element(double(t), (n+1)/2, flag_KthE);
+ end;
+ else
+ t = sort(t);
+ if ~rem(n,2),
+ y(xo) = (t(n/2) + t(n/2+1)) / 2;
+ elseif rem(n,2),
+ y(xo) = t((n+1)/2);
+ end;
+ end
+
+ if (n