/usr/share/octave/packages/statistics-1.2.3/trimmean.m is in octave-statistics 1.2.3-1.
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 | ## Copyright (C) 2001 Paul Kienzle <pkienzle@users.sf.net>
##
## 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/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{a} =} trimmean (@var{x}, @var{p})
##
## Compute the trimmed mean.
##
## The trimmed mean of @var{x} is defined as the mean of @var{x} excluding the
## highest and lowest @var{p} percent of the data.
##
## For example
##
## @example
## mean ([-inf, 1:9, inf])
## @end example
##
## is NaN, while
##
## @example
## trimmean ([-inf, 1:9, inf], 10)
## @end example
##
## excludes the infinite values, which make the result 5.
##
## @seealso{mean}
## @end deftypefn
function a = trimmean(x, p, varargin)
if (nargin != 2 && nargin != 3)
print_usage;
endif
y = sort(x, varargin{:});
sz = size(x);
if nargin < 3
dim = min(find(sz>1));
if isempty(dim), dim=1; endif;
else
dim = varargin{1};
endif
idx = cell (0);
for i=1:length(sz), idx{i} = 1:sz(i); end;
trim = round(sz(dim)*p*0.01);
idx{dim} = 1+trim : sz(dim)-trim;
a = mean (y (idx{:}), varargin{:});
endfunction
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