/usr/share/octave/packages/nan-2.8.1/trimmean.m is in octave-nan 2.8.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | function Q=trimmean(Y,p,DIM)
% TRIMMEAN calculates the trimmed mean by removing the fraction of p/2 upper and
% p/2 lower samples. Missing values (encoded as NaN) are ignored and not taken into account.
% The same number from the upper and lower values are removed, and is compatible to various
% spreadsheet programs including GNumeric [1], LibreOffice, OpenOffice and MS Excel.
%
% Q = trimmean(Y,p)
% Q = trimmean(Y,p,DIM)
% returns the TRIMMEAN along dimension DIM of sample array Y.
% If p is a vector, the TRIMMEAN for each p is computed.
%
% see also: MAD, RANGE, HISTO2, HISTO3, PERCENTILE, QUANTILE
%
% References:
% [1] http://www.fifi.org/doc/gnumeric-doc/html/C/gnumeric-trimmean.html
% $Id: trimmean.m 8953 2011-11-03 11:00:50Z schloegl $
% Copyright (C) 2009,2010,2011 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<3,
DIM = [];
end;
if isempty(DIM),
DIM = find(size(Y)>1,1);
if isempty(DIM), DIM = 1; end;
end;
if nargin<2,
help trimmean
else
sz = size(Y);
if DIM > length(sz),
sz = [sz,ones(1,DIM-length(sz))];
end;
D1 = prod(sz(1:DIM-1));
D2 = length(p);
D3 = prod(sz(DIM+1:length(sz)));
Q = repmat(nan,[sz(1:DIM-1),D2,sz(DIM+1:length(sz))]);
for k = 0:D1-1,
for l = 0:D3-1,
xi = k + l * D1*sz(DIM) + 1 ;
xo = k + l * D1*D2;
t = Y(xi:D1:xi+D1*sz(DIM)-1);
t = sort(t(~isnan(t)));
N = length(t);
for m=1:D2,
n = floor(N*p(m)/2);
f = sum(t(1+n:N-n))/(N-2*n);
Q(xo + m*D1) = f;
end;
end;
end;
end;
%!assert(trimmean([11.4, 17.3, 21.3, 25.9, 40.1],.2),23.2)
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