/usr/share/octave/packages/3.2/statistics-1.0.10/trimmean.m is in octave-statistics 1.0.10-1.
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
##
## 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/>.
## -*- 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)
usage("a = trimmean(x,p, dim)");
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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