/usr/share/octave/packages/3.2/nan-2.4.4/coefficient_of_variation.m is in octave-nan 2.4.4-1.
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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 | function cv=coefficient_of_variation(i,DIM)
% COEFFICIENT_OF_VARIATION returns STD(X)/MEAN(X)
%
% cv=coefficient_of_variation(x [,DIM])
% cv=std(x)/mean(x)
%
% see also: SUMSKIPNAN, MEAN, STD
%
% REFERENCE(S):
% http://mathworld.wolfram.com/VariationCoefficient.html
% $Id: coefficient_of_variation.m 8223 2011-04-20 09:16:06Z schloegl $
% Copyright (C) 1997-2003 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 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/>.
if nargin<2,
DIM = find(size(i)>1,1);
if isempty(DIM), DIM=1; end;
end;
[S,N,SSQ] = sumskipnan(i,DIM);
% sqrt((SSQ-S.*S./N)./max(N-1,0))/(S./N); % = std(i)/mean(i)
cv = sqrt(SSQ.*N./(S.*S)-1);
%if flag_implicit_unbiased_estim,
cv = cv.*sqrt(N./max(N-1,0));
%end;
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