/usr/share/octave/packages/nan-2.8.1/mean.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 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | function [y]=mean(x,DIM,opt,W)
% MEAN calculates the mean of data elements.
%
% y = mean(x [,DIM] [,opt] [, W])
%
% DIM dimension
% 1 MEAN of columns
% 2 MEAN of rows
% N MEAN of N-th dimension
% default or []: first DIMENSION, with more than 1 element
%
% opt options
% 'A' arithmetic mean
% 'G' geometric mean
% 'H' harmonic mean
%
% W weights to compute weighted mean (default: [])
% if W=[], all weights are 1.
% number of elements in W must match size(x,DIM)
%
% usage:
% mean(x)
% mean(x,DIM)
% mean(x,opt)
% mean(x,opt,DIM)
% mean(x,DIM,opt)
% mean(x,DIM,W)
% mean(x,DIM,opt,W); '
%
% features:
% - can deal with NaN's (missing values)
% - weighting of data
% - dimension argument also in Octave
% - compatible to Matlab and Octave
%
% see also: SUMSKIPNAN, MEAN, GEOMEAN, HARMMEAN
%
% $Id: mean.m 12706 2014-09-12 17:46:13Z schloegl $
% Copyright (C) 2000-2004,2008,2009,2011 by Alois Schloegl <alois.schloegl@gmail.com>
% This is part of the NaN-toolbox. For more details see
% 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==1,
%------ case: mean(x)
W = [];
DIM=[];
opt='a';
elseif (nargin==2)
W = [];
%if ~isnumeric(DIM), %>=65;%abs('A'),
if (DIM>64) %abs('A'),
%------ case: mean(x,opt)
opt=DIM;
DIM=[];
elseif (DIM>length(size(x)))
y=x;
return;
else
%------ case: mean(x,DIM)
opt='a';
end;
elseif (nargin == 3),
if isnumeric(DIM) && isnumeric(opt)
%------ case: mean(x,DIM,W)
W = opt;
opt='a';
elseif (DIM>64) %abs('A'),
%------ case: mean(x,opt,DIM)
%if ~isnumeric(DIM), %>=65;%abs('A'),
tmp=opt;
opt=DIM;
DIM=tmp;
W = [];
elseif (DIM>length(size(x)))
y=x;
return;
else
%------ case: mean(x,DIM,opt)
W = [];
end;
elseif nargin==4,
%------ case: mean(x,DIM,opt,W)
;
else
help mean
% fprintf(1,'usage: mean(x) or mean(x,DIM) or mean(x,opt,DIM) or mean(x,DIM,opt) or mean(x,DIM,W) or mean(x,DIM,opt,W); '
end;
if isempty(opt)
opt = 'A';
elseif any(opt=='aAgGhH')
opt = upper(opt); % eliminate old version
else
error('Error MEAN: invalid opt argument');
end;
if (opt == 'A')
[y, n] = sumskipnan(x,DIM,W);
y = y./n;
elseif (opt == 'G')
[y, n] = sumskipnan(log(x),DIM,W);
y = exp (y./n);
elseif (opt == 'H')
[y, n] = sumskipnan(1./x,DIM,W);
y = n./y;
else
fprintf (2,'mean: option `%s` not recognized', opt);
end
%!assert(mean([1,NaN],1),[1,NaN])
%!assert(mean([1,NaN],2),1)
%!assert(mean([+inf,-inf]),NaN)
%!assert(mean([+0,-0],'h'),NaN)
%!assert(mean([1,4,NaN],'g'),2)
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